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Author: Arun K. Sehra Publisher: ISBN: Category : Aerodynamics, Transonic Languages : en Pages : 228
Book Description
The effect of blade-to-blade flow variations on the mean flow field of a highly loaded transonic axial flow compressor was invesitaged. The theoretical approach centered around modeling of three important phenomena associated with blade-to-blade flow fluctuations, which control the mean momentum and energy transfer processes. Apparent stresses were introduced into the mean flow momentum equations by pitchwise averaging. Loss concept of mean relative total pressure, due to conversion of mean flow kinetic energy to the energy of fluctuations, was introduced. Based on this concept, mean rothalpy and the production of apparent entropy were defined. An expression for mean rothalpy variation along the streamline was derived by pitchwise averaging of the energy equation. Mean flow equations suitable for the streamline curvature computational scheme were developed which include these three effects. Apparent stresses, mean rothalpy and apparent entropy variations were calculated from measured velocity fluctuations. The revised streamline curvature procedure was then used to predict the axisymmetric (peripheral mean) flow. The agreement of rotor outlet tangential velocity is excellent reproducing an unusual peak which is not explainable by usual techniques. The results showed that 3-D inviscid effects do not significantly modify the mean flow, and that the direct effect of apparent stresses on the mean flow is also small.
Author: Arun K. Sehra Publisher: ISBN: Category : Aerodynamics, Transonic Languages : en Pages : 228
Book Description
The effect of blade-to-blade flow variations on the mean flow field of a highly loaded transonic axial flow compressor was invesitaged. The theoretical approach centered around modeling of three important phenomena associated with blade-to-blade flow fluctuations, which control the mean momentum and energy transfer processes. Apparent stresses were introduced into the mean flow momentum equations by pitchwise averaging. Loss concept of mean relative total pressure, due to conversion of mean flow kinetic energy to the energy of fluctuations, was introduced. Based on this concept, mean rothalpy and the production of apparent entropy were defined. An expression for mean rothalpy variation along the streamline was derived by pitchwise averaging of the energy equation. Mean flow equations suitable for the streamline curvature computational scheme were developed which include these three effects. Apparent stresses, mean rothalpy and apparent entropy variations were calculated from measured velocity fluctuations. The revised streamline curvature procedure was then used to predict the axisymmetric (peripheral mean) flow. The agreement of rotor outlet tangential velocity is excellent reproducing an unusual peak which is not explainable by usual techniques. The results showed that 3-D inviscid effects do not significantly modify the mean flow, and that the direct effect of apparent stresses on the mean flow is also small.
Author: John J. Adamczyk Publisher: ISBN: Category : Languages : en Pages : 40
Book Description
A properly scaled form of the average-passage equation system would provide an improved mathematical model for simulating the flow in multistage machines at design and at off-design conditions.
Author: North Atlantic Treaty Organization. Advisory Group for Aerospace Research and Development Publisher: ISBN: Category : Aerodynamics Languages : en Pages : 356
Author: Arun K. Sehra
Author: Arun K. Sehra
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Author: Lewis Research Center
Author: Maritime Research Information Service
Author: Robert O. Bullock
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Author: John J. Adamczyk
Author: North Atlantic Treaty Organization. Advisory Group for Aerospace Research and Development