고공환경 모사용 이차목 디퓨저의 배압에 따른 성능 특성

국문 초록 (Abstract)

본 연구에서는 이차목 디퓨저의 배압에 따른 특성과 디퓨저 내부의 유동을 확인하기 위해서 실험과 수치해석을 통하여 살펴보았다. 디퓨저의 배압(Pa)조건을 모사하기 위해 이젝터를 사용하였으며, 디퓨저와 이젝터는 상온 고압기체질소를 사용하였다. 그 결과, 노즐전단압력(P0)이 동일할 때 배압(Pa)을 낮추어 압력비(P0/Pa)를 높게 할수록 압력회복이 디퓨저 후단에서 이루어짐을 확인하였다. 노즐전단압력(P0)이 다르더라도 압력비(P0 /Pa)가 동일하다면 디퓨저 내부의 유동특성이 거의 동일함을 확인하였으며, 시동압력비((P0/Pa)st) 또한 일치함을 확인하였다.

다국어 초록 (Multilingual Abstract)

Experimental and numerical studies were performed to investigate the performance and internal flow characteristics of a supersonic second throat exhaust diffuser (STED) with back pressure (Pa). An ejector system was used to vary the back pressure (Pa) conditions. The operating gas for the STED and the ejector was high pressure nitrogen at room temperature. When the back pressure (Pa) at a constant nozzle inlet pressure P0) decreases, the pressure recovery location moves downstream. If the pressure ratio P0/Pa) is the same, even if the nozzle inlet pressures P0) are different, the diffuser"s internal flow pattern and starting pressure ratio ((P0/Pa)st) are almost the same.

목차 (Table of Contents)

• 초록
• Abstract
• 1. 서론
• 2. 실험장치 및 실험방법
• 3. 실험 및 수치해석결과
• 4. 결론
• 참고문헌(References)

참고문헌 (Reference)

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15 전준수, "2차목 초음속 디퓨저의 형상 변화에 따른 성능에 관한 실험적 연구" 대한기계학회 38 (38): 279-288, 2014