Investigation Of Advanced Counterrotation Blade Configuration Concepts For High Speed Turboprop Systems Task 8 Cooling Flow Heat Transfer Analysis

Author : National Aeronautics and Space Administration (NASA)
Publisher : Createspace Independent Publishing Platform
ISBN 13 : 9781723185854
Total Pages : 156 pages
Book Rating : 4.1/5 (858 download)

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Download or read book Investigation of Advanced Counterrotation Blade Configuration Concepts for High Speed Turboprop Systems, Task 1 written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-07-18 with total page 156 pages. Available in PDF, EPUB and Kindle. Book excerpt: The time-dependent three-dimensional Euler equations of gas dynamics were solved numerically to study the steady compressible transonic flow about ducted propfan propulsion systems. Aerodynamic calculations were based on a four-stage Runge-Kutta time-marching finite volume solution technique with added numerical dissipation. An implicit residual smoothing operator was used to aid convergence. Two calculation grids were employed in this study. The first grid utilized an H-type mesh network with a branch cut opening to represent the axisymmetric cowl. The second grid utilized a multiple-block mesh system with a C-type grid about the cowl. The individual blocks were numerically coupled in the Euler solver. Grid systems were generated by a combined algebraic/elliptic algortihm developed specifically for ducted propfans. Numerical calculations were initially performed for unducted propfans to verify the accuracy of the three-dimensional Euler formulation. The Euler analyses were then applied for the calculation of ducted propfan flows, and predicted results were compared with experimental data for two cases. The three-dimensional Euler analyses displayed exceptional accuracy, although certain parameters were observed to be very sensitive to geometric deflections. Both solution schemes were found to be very robust and demonstrated nearly equal efficiency and accuracy, although it was observed that the multi-block C-grid formulation provided somewhat better resolution of the cowl leading edge region. Hall, Edward J. and Delaney, Robert A. and Bettner, James L. Unspecified Center COMPRESSIBLE FLOW; COMPUTATIONAL FLUID DYNAMICS; CONTRAROTATING PROPELLERS; EULER EQUATIONS OF MOTION; FLOW DISTRIBUTION; FLOW EQUATIONS; PROP-FAN TECHNOLOGY; PROPELLER FANS; THREE DIMENSIONAL FLOW; TRANSONIC FLOW; CONVERGENCE; GRID GENERATION (MATHEMATICS); LEADING EDGES; RUNGE-KUTTA METHOD; TIME MARCHING...