Transactions of the Korean Society of Mechanical Engineers B (대한기계학회논문집B)

The Korean Society of Mechanical Engineers (대한기계학회)
권호 표지
DOI QR코드

DOI QR Code

Investigation of Effect of Shape of Pintle on Drag and Thrust Variation

핀틀 형상에 따른 추력 및 항력 변화 연구

  • Published : 2010.03.01
Download PDF
⟨ Previous Next ⟩

Abstract

In this study, the effect of the shape of a pintle(obstacle) on thrust-modulation performance and drag in a pintle rocket was investigated by a cold flow test and by computational fluid dynamics. Pintle movement caused a monotonic increase in the chamber pressure. Thrust generated by the pressure distribution on the pintle body was linearly changed to the chamber pressure, and this thrust was greater than that generated by the nozzle-wall pressure distribution. Because the shock pattern in the nozzle changes with the shape of the pintle body and pressure ratio, the thrust generated by the nozzle-wall pressure is not directly affected by chamber pressure. The drag due to the pintle(obstacle) can be minimized for a fully linear pintle shape, regardless of chamber pressure.

본 논문에서는 수치해석과 공압실험으로 핀틀 로켓에 적용된 핀틀 형상이 추력과 항력에 미치는 영향을 분석 하여 제시하였다. 핀틀 움직임으로 노즐목 면적이 감소할 때 연소실 압력은 부드럽게 증가한다. 그리고 핀틀 몸체의 압력에 의한 추력은 연소실 압력에 비례하여 증가하였으며 노즐 벽면 압력에 의한 추력 보다 큰 값을 가졌다. 그리고 노즐 내부의 충격파가 핀틀 형상과 압력비에 따라 변하기 때문에 노즐 벽면 압력에 의한 추력은 연소실 압력에 무관하였다. 핀틀에 의한 항력은 연소실 압력과 무관하게 완전히 선형적인 핀틀 형상에 서 최소 크기를 가졌다.

Keywords

References

  1. John Napior and Victoria Garmy,, 2006,“Controllable Solid Propulsion For Launch VehicleAnd Spacecraft Application," AIAA 2006-2396.
  2. Ronald W. Humble, Gart N. Henry and Wiley J.Larson, 1995, "Space Propulsion Analysis andDesign," McGraw-Hill, Inc., pp. 295-364.
  3. Godai and M. Shimizu, 1972, "Pressure Exponent of Controllable Solid Rocket Propellants," AIAA 72-1135.
  4. Charles T. Levinsky and Gerald F. Kobalter, 1967,"Feasibility Demonstration of a Single-ChamberControllable Solid Rocket Motor," AFRPL-TR 67-330
  5. Unmack, K.E., 1987, "Wide Range Thrust Throttlingof a Solid Rocket Motor," AIAA-87-2085
  6. Randall Smith-Kent, Hai-Tien Loh and Pawel Chwalowski, 1995, "Analytical Contourring of Pintle Nozzle Exit Cone Using Computational Fluid Dynamics," AIAA 95-2877.
  7. Prozan, R.J. and Luke, G.D., 1999, "CFD Prediction of Nozzle Flow Separation Without Boundary Layer Resolution," AIAA 99-2645
  8. Francis R. Hama, 1966, "Experimental Investigation of Wedge Base Pressure and Lip Shock," Jet Propulsion Lab., Report NO.32-1033
  9. Kim Joung-keun, Lee Ji-hyung and Jang Hong-bin, 2008, “Report of Cold flow Test of Pintle," ADDR-421-080682.