In this work we want to study axisymmetric and nonaxisymmetric structures, evocated by the magnetorotational instability in the outer regions of protoplanetary disks. Secondary flow and endwall optimization of a transonic turbine. The calculated results indicated that the profiled endwall minimized the lateral movement of weaker boundary layer fluid from the hub pressure surface corner. Cfd investigation on the application of optimum non axisymmetric endwall profiling for a vaned diffuse pages. End wall profiling aims to reduce the aerodynamic losses or heat transfer rates by shaping the end walls of the turbine. A geometry generation framework for contoured endwalls.
The results show a reduction of the static pressure nonuniformities by 70%. In other words, analytical and experimental work focused on profile losses alone is. Author concluded that there was a little impact of punch geometry on the maximum load, for the same logarithmic deformation. Designers have successfully used nonaxisymmetric endwall contouring. Pdf nonaxisymmetric endwall profiling in a turbine rotor blade. The overall nonaxisymmetric geometry is reduced by selecting a tilt angle balancing the figure in the meridional plane at the extreme radial positions. In proceedings of the asme 1994 international gas turbine and aeroengine congress and exposition, the hague, the netherlands, 16 june 1994. Fem 2d bar elements and axisymmetric file exchange. Pdf nonaxisymmetric turbine end wall profiling researchgate. Offaxis conic surfaces for nonaxisymmetric surface generation. Nonaxisymmetric endwall profiling in a turbine nozzle blade cascade. Effect of camber on nonaxisymmetric endwall contouring. In the present case, the solution flow below the crystal was. Non axisymmetric endwall contouring is a wellknown but somewhat controversial technique which was developed originally for the reduction of the losses associated with turbine disc leakage flows 3.
Nonaxisymmetric endwall contouring is a wellknown but somewhat controversial technique which was developed originally for the reduction of the losses associated with turbine disc leakage flows 3. The basic axisymmetric structural element analyzed is the conical shell, and its. Rosenonaxisymmetric endwall profiling in the hp ngvs of an axial flow gas turbine. Nonaxisymmetric endwall contouring techniques have been widely applied in gas turbines. Secondary flows presence in turbines is identified as one of the main reason for losses and less efficiency performance. Turbine technical conference and exposition, american soc. Jun 26, 2019 the student community is a public forum for authorized ansys academic product users to share ideas and ask questions. Most of the situations the loading that comes on the structures are also symmetric.
The optimization method is based on a genetic algorithm. Axisymmetric solid with nonaxisymmetric load using matlab jaya lekshmi r, sanju mary sobichen, m. Application of nonaxisymmetric endwall contouring to conventional. On and offdesign performance of a model rotating turbine. Axisymmetric analysis a problem in which the geometry. Application to circular reservoirs cristiano yudok chung rodrigues abstract the present paper addresses the linear analysis of axially symmetric structures of thin shell subjected to axisymmetric loads. Axisymmetric endwall contour for a highlift low pressure turbine blade be. Fem 2d bar elements and axisymmetric file exchange matlab. Non axisymmetric endwall is first used in the turbines to make the flow field of stator more uniform and reduce the secondary flow losses 1,2. Optimization and knowledge discovery of a threedimensional parameterized vane with nonaxisymmetric endwall. Numerical simulations were conducted by commercial software numeca. In this paper, the focus lies on intermediate sshaped duct endwall profiling and its influence. The timeresolved flowfield is measured in the passage of a linear turbine cascade to show the effects of endwall film cooling and non axisymmetric endwall contouring on the passage secondary flows. In this paper, nonaxisymmetric endwall contouring optimizations in a high pressure turbine second vane passage were performed with and without including the rim seal flow.
Design of non axisymmetric endwall profiling of the endwall is done in such a way to have convex curvature in the pressure side and concave curvature causes the cross passage pressure gradient that drives secondary flow, so that mirroring the blade curvature on the endwall should assist in eliminating this effect. American society of mechanical engineers digital collection. Profiled endwalls have been shown to effectively reduce secondary flow but have often been used as a retrofit application where the blade design is left unchanged. The perturbation law of nonaxisymmetric endwall was based on bezier curves, and the commercially available optimization software numeca finedesign 3d was used to design the nonaxisymmetric endwall. Croonquist jet propulsion laboratory california institutu of technology 4b30 oak grove drive pasadena, california 91109 abstract the nonaxisymmetric shapes of a rotating drop in an immiscible system have been studied. Axisymmetric finite element modeling for the design and. This paper describes the effects of nonaxisymmetric endwall profiling on the aerodynamic performance of a linear turbine cascade at different incidence angles. A simplified model and a 6equation system for the physical connection between the endwall geometry and secondary. Nonaxisymmetric endwall profiling in the hp ngvs of an axial flow gas turbine. Development of an automated nonaxisymmetric endwall. The research object of the report is an axial flow dualstage counterrotating compressor. This estimate is likely to reduce the non axisymmetric tool motion near the center point but cannot optimize the non axisymmetric motion at any radial distance away from that point. The required endwall shape is nonaxisymmetric and is generated parametrically by.
Add a small part of the axisymmetric section in the 3d model to have sufficient margin for the transition to take place 3. The student community is a public forum for authorized ansys academic product users to share ideas and ask questions. Perspectives on the treatment of secondary flows in axial turbines. Nonaxisymmetric endwall profiling in a highly loaded. Proceedings of the international gas turbine and aerospace. We achieved the convex growth interface shape in topseeded solution growth of sic applying nonaxisymmetric solution convection induced by nonaxisymmetric temperature distribution.
Optimization and knowledge discovery of a threedimensional. Very few studies of nonaxisymmetric endwall profiling in compressor have been conducted in published literatures. Please see attached for the details of the geometry and the mesh. Nonaxisymmetric endwall profiling in the hp ngvs of. Computational investigation of secondary flow losses in. Axisymmetric flow article about axisymmetric flow by the. Nonaxisymmetric shroud profiled endwall optimization of an.
A novel surface definition is used to design the nonaxisymmetric stator casing of a 1. In this work, we investigate the influence of the spatial distribution of such grains on the submm appearance of magnetized protoplanetary disks. The current paper presents experimental and computational results to assess the effectiveness of non axisymmetric endwall contouring in a compressor linear cascade. The aim of the study is to depress the tip separation of s3 by endwall profiling. This profile has been manufactured and fitted to the durham linear cascade. Axisymmetric definition and meaning collins english. Nonaxisymmetric endwalls target the control of secondary flows and are designed using detailed computational fluid dynamics coupled with a variety of optimisation algorithms and utilising a number of objective. Rose proceedings of the institution of mechanical engineers, part a.
The current paper presents experimental and computational results to assess the effectiveness of nonaxisymmetric endwall contouring in a compressor linear cascade. The effect of nonaxisymmetric endwall contouring on compressors is not clear. Is there any way to get symmetric and anti symmetric part of the displacement. The timeresolved flowfield is measured in the passage of a linear turbine cascade to show the effects of endwall film cooling and nonaxisymmetric endwall contouring on the passage secondary flows. As a passive flow control approach, nonaxisymmetric endwall profiling can effectively suppress the secondary flow and flow separation, in which concaveconvexity profiling is applied on the endwall to reduce the lateral pressure difference. The purpose was to reduce coolant leakage as proposed by rose 1994. Turbine cascade design and experimental validations, proceedings of asme turbo expo 2014. Asme 1994 international gas turbine and aeroengine congress and exposition, hague, netherlands, 1994. The endwalls were generated parametrically with a sinusoidal profile applied in the. Generate mapped mesh of linear mesh200 elements on the surface of 3d model that connects to the axisymmetric section.
Development of an automated nonaxisymmetric endwall contour. Aerodynamic performances of two contoured endwalls were studied and compared with the planar endwall case. Identify axisymmetric and nonaxisymmetric sections of the model 2. In this paper, non axisymmetric endwall contouring optimizations in a high pressure turbine second vane passage were performed with and without including the rim seal flow. Optimization of endwall contouring in axial compressor sshaped. Nonaxisymmetric endwall profiling in the hp ngvs of an axial flow gas turbine, asme 1994. Axisymmetric analysis a problem in which the geometry, loadings, boundary conditions and materials are symmetric with respect to an axis is one that can be solved as an axisymmetric problem instead of as a three dimensional problem to illustrate this type of analysis consider the problem of finding the stresses in a thick openended cylinder with an internal pressure such as a pipe. The endwall was designed by an endwall design optimization platform at 0o incidence design condition. The effect of non axisymmetric endwall contouring on compressors is not clear. Axisymmetric definition of axisymmetric by the free. Previous studies show that nonaxisymmetric endwall could be used to. K sundaresan, r marimuthu abstractin general rocket structural configurations are symmetric with respect to axis.
Optimization of the nonaxisymmetric stator casing of a 1. This technology is based on the principle that convexity curvature of the wall can locally. Figure 1 gedora screw wrenches 8 one of the typical applications of non axisymmetric cold extrusion is a mass production of gedora screw. If you have the appropriate software installed, you can download article citation data to the citation manager of your choice. Here, we report on the application of nonaxisymmetric endwall. Turbine blade row optimization through endwall contouring. However, limited work has been reported on using non axisymmetric endwalls at the stator casing and on its interaction with the tip leakage flow. Nonaxisymmetric endwall profiling of a stator row in the. This study investigates the control mechanism of nonaxisymmetric endwall on the flow field of a highly loaded compressor cascade and the guidelines for the design of nonaxisymmetric endwall.
A nonaxisymmetric endwall profile has been designed using cfd with the aim of reducing endwall pressure nonuniformities downstream of a rotor blade. Flow through turbine stages is threedimensional and highly complex due to secondary flows, axial and tip clearances, 3d blades, rotational effects, varying fluid properties, turbulence effects, boundary layer development, etc. Frank gersbach product manager additive manufacturing. The flow simulation in the turbine was conducted by using steady rans. Flow feature in a turbine cascade with endwall profiling, journal of. Control of interface shape by nonaxisymmetric solution. Croonquist jet propulsion laboratory california institutu of technology 4b30 oak grove drive pasadena, california 91109 abstract the non axisymmetric shapes of a rotating drop in an immiscible system have been studied. The sinusoidal profiling is carried out with constant profile curvature along the mean streamline path. The whole process should not take more than a couple of minutes. I am meshing a turbomachinery blade passage with pointwise trex. The durham university cascade 10 is another example of a cascade in this general class, and has been used variously to investigate the effect of skewed inlet flow, upstream slot injection, and, more recently, nonaxisymmetric endwall profiling on the cascade losses. Nonaxisymmetric endwall profiling in the hp ngvs of an.
Design of nonaxisymmetric endwall profiling of the endwall is done in such a way to have convex curvature in the pressure side and concave curvature causes the cross passage pressure gradient that drives secondary flow, so that mirroring the blade curvature on the endwall should assist in eliminating this effect. Offaxis conic surfaces for nonaxisymmetric surface. Nonaxisymmetric shapes of a rotating drop in an immiscble system t. Cfd investigation on the application of optimum nonaxisymmetric endwall profiling for a vaned diffuse pages. In this paper, a non axisymmetric endwall design method for the stator casing is implemented through a novel surface definition, towards mitigating secondary flow losses. A genetic algorithm based on the artificial neural network was used as the optimization method.
The detailed solution flow, temperature distribution and carbon concentration distribution were calculated by 3dimensional numerical analysis. Nonaxisymmetric endwall profiling of a stator row in the presence of the rotor in a high pressure turbine. This study investigates the control mechanism of non axisymmetric endwall on the flow field of a highly loaded compressor cascade and the guidelines for the design of non axisymmetric endwall. Optimization of the axisymmetric and the nonaxisymmetric endwall. Very few studies of non axisymmetric endwall profiling in compressor have been conducted in published literatures. The nonaxisymmetric endwall profiling has been proven to be an effective tool to reduce the secondary flow loss in turbomachinery.
Nonaxisymmetric endwalls in turbine stages have shown to be a robust method to improve the performance of turbines in both power generation and aeroderivative applications. Non axisymmetric shapes of a rotating drop in an immiscble system t. National basic research program of china 2012cb720201 and beijing. Nonaxisymmetric endwall profiling in a highly loaded compressor. Figure 7, calculation grid for the moore elliptic flow program. Simply select your manager software from the list below and click on download. Pdf a nonaxisymmetric endwall profile has been designed using cfd with the aim of reducing. Nonaxisymmetric endwall profiling in a turbine rotor blade. Advantages, limitations and error estimation of mixed. Numerical investigation and nonaxisymmetric endwall.
The design builds on previous work on nonaxisymmetric profiled endwalls by combining them with threedimensional blade design. In this paper, we present the computed flow results for those endwall designs produced using the automated nonaxisymmetric endwall design procedure and target objective functions detailed in part 1 of this paper, and where available, compare these with experimental measurements made using the csir lowspeed research turbine used as the test case for the designs. The required endwall shape is nonaxisymmetric and is generated parametrically by altering a calculation grid for an existing ngv. Nonaxisymmetric shapes of a rotating drop in an immisc. Dragy drag reduction via turbulent boundary layer flow control.
On an interpolation based spectral homotopy analysis method for pde based unsteady boundary layer flows. Axisymmetric definition of axisymmetric by the free dictionary. Axisymmetric definition and meaning collins english dictionary. The application of 3d blading and nonaxisymmetric hub. Recent observations by the atacama large millimetersubmillimeter array alma of disks around young stars revealed distinct asymmetries in the dust continuum emission.
The variation between the optimum slope and the original parent slope for the keck segments are within a few seconds of the arc. Nonaxisymmetric endwall profiling in a turbine rotor. Effects of nonaxisymmetric endwall contouring and film. Cfd investigation on the application of optimum non. Pdf a design method for profiling the end wall to reduce secondary flow has been reported. Optimization strategy for a singlestage axisymmetric hub. Anisotrpic tetrahdera is genrated only on the outer. Axisymmetric solid with nonaxisymmetric load using matlab.
Nonaxisymmetric endwall contouring is a mechanism which attempts to reduce the negative effects of secondary flows in compressor and turbine blade rows by allowing the otherwise cylindrical turbine endwalls to take on threedimensional and therefore nonaxisymmetric curvature in an attempt to favourably manipulate the endwall pressure fields which drive these flows. Rose, nonaxisymmetric endwall profiling in the hp ngvs of an axial flow gas turbine, in asme 1994 international gas turbine and aeroengine congress and exposition pp. Investigation of nonaxisymmetric endwall contouring in a. American society of mechanical engineers, jun 1994. However, if a physical mechanism or a model could be included in the optimization method, the effects could be possibly predicted. Research on effects of incidence to turbine guide cascade. Dust grains with sizes around submm are expected to couple only weakly to the gas motion in regions beyond 10 au of circumstellar disks. Nonaxisymmetric shroud profiled endwall optimization of. Endwall contouring optimization in a high pressure turbine. The design objective was to minimize the total pressure losses. Axisymmetric analysis a problem in which the geometry, loadings, boundary conditions and materials are symmetric with respect to an axis is one that can be solved as an axisymmetric problem instead of as a three dimensional problem. Turbine blade row optimization through endwall contouring by. Non axisymmetric endwall contouring, which was introduced for the first time by rose in 1994, 5 has been widely used in turbines to reduce endwall secondary flows.