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Suppression of Shock-Induced Separation in Dense Gases = 비열이 큰 유체에서 발생하는 충격파 유발 박리 현상의 억제에 관한 연구
- 자료유형
- 기사
- ISSN
- 12269387
- 서명/저자
- Suppression of Shock-Induced Separation in Dense Gases = 비열이 큰 유체에서 발생하는 충격파 유발 박리 현상의 억제에 관한 연구 / 박상혁
- 발행사항
- 서울 : 용인송담대학, 1998.
- 형태사항
- pp. 209-216
- 초록/해제
- 요약 :We consider the reflection of oblique compression waves from a two-dimensional, steady, flat-plate, laminar boundary layer. The full Navier-Stokes equations are solved numerically through use of a dense gas version of the Beam-Warming implicit scheme. In the classical perfect gas theory the compression waves are necessarily shocks. As is well-known, the adverse pressure gradient carried by these shocks can lead to boundary layer separation.In the present investigation we consider the behavior of Bethe-Zel'dovich-Thompson(BZT) fluids in the context of this classical benchmark problem. Bethe-Zel'dovich-Thompson (BZT) fluids are ordinary gases which have specific heats large enough to cause the fundamental derivative of gasdynamics (1) to be negative over a finite range of temperatures and pressure in the single-phase vapor regime. Here ρ, p, α, and s are the fluid density, presure, sound speed, and entropy, respectively. The quantity V≡ρ-1 . When Γ<0 everywhere in a particular flow, compression discontinuities are known to violate the entropy inequality. If such an inadmissible discontinuity is introduced into a flow, e.g., by a wedge or a sharp leading or trailing edge of a turbine blade, it naturally disintegates into a centered fan. Thus, the adverse pressure gradient carried by the compression wave is significantly reduced by the natural inviscid dynamics of Γ0 fluids. The purpose of the present study is to determine whether this reduction in the adverse pressure gradient can suppress boundary layer separation. We make direct comparisons between the behavior of BZT fluids and more conventional fluids such as steam. The primary result of interest is that this suppression of separation can indeed be achieved. The physical mechanism for the suppression is discussed as are strategies for realizing the suppression in practical configurations.
- 기타저자
- 박상혁
- 기본자료저록
- 용인송담대학 論文集 : 第1集 1998, 03
- 전자적 위치 및 접속
- 원문정보보기
- 원문파일정보
- 1-209.pdf
- 모체레코드
- 모체정보확인
- Control Number
- yscl:20590
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