| Summary: | 碩士 === 國立屏東科技大學 === 車輛工程系所 === 105 === Scramjet is an engine mainly used in the hypersonic flight regime. In order to get high performance combustion efficiency, the inlet-isolator have to adapt configuration from rectangular into circle or elliptical. The main purpose of this study focuses on the design and flowfield of the sidewall compression in a hypersonic inlet as following: (1) change the shape of outlet from rectangular to elliptical with the outlet area and aspect ratio are fixed; (2) different aspect ratio of elliptical outlet isolator with the area of outlet is fixed; (3) different area of circle outlet isolator with the shape of the outlet is fixed; and (4) to consider the optimal design, to study the total pressure recovery (P_T) by changing the cross section of inlet-isolator.
In this study, we applied numerical simulation method of the finite volume method to solve Navier-Stokes equations with Spalart-Allmaras turbulent model to simulate cases on the flowfield of the inlet-isolator.
At Mach No. 4: (1) the recover coefficient (P_T) of the elliptical outlet case is more than rectangular case about 1.4% in the same outlet aspect ratio (H/S); (2) the aspect ratio of 1:2 got the highest P_T than others in all elliptical cases, and the P_T increased 3.57% more than rectangular case; (3) the P_T increased 1.73% than original case while the outlet area increased; (4) for the optimal design, the P_T increased 12.5% than original case.
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