• Title/Summary/Keyword: Pintle-Type Rocket Motor

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Numerical Studies on Flow Structures with Various Shapes of Needle-type Pintle in Solid Rocket Motor (Needle 형 pintle 형상에 따른 고체 로켓 모터 내부 유동장의 수치적 연구)

  • Park, Byung-Hoon;Kim, Sang-Min;Yoon, Woong-Sup;Lee, Ji-Hyung
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • 2011.04a
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    • pp.249-252
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    • 2011
  • 고체로켓추진기관의 추력조절을 위해 핀틀 기술이 사용된다. 아직까지 핀틀 유동에 대해 근본적인 물리적 이해를 돕는 연구가 공개되지 않아, 이 연구에서 다양한 형상의 needle형 핀틀에 따른 유동구조에 대한 수치적 연구를 진행하였다. 2차원 축대칭, 압축성을 고려하여, 상용 열유체 해석 프로그램인 FLUENT 6.2를 사용하여 해석을 수행하였다. 난류 모델을 검증하기 위해 기 수행된 실험 결과와 비교하였다. 핀틀 각도(tip angle)가 작아질수록 노즐에서 유동 박리점이 하류로 이동하며, 핀틀에서 발생하는 끝단 충격파가 약해진다. 핀틀 반경(tip radius)이 작아질수록 핀틀에서 발생하는 끝단 충격파가 하류로 이동하며, 크기는 약해진다. 핀틀 형상(contour)은 유동 박리 지점에 직접적인 영향을 미친다.

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Experimental Study and Performance Analysis of the Solid Rocket Motor with Pintle Nozzle (핀틀-노즐이 적용된 고체추진기관의 연소 시험 성능 분석)

  • Jin, Jungkun;Ha, Dong Sung;Oh, Seokjin
    • Journal of the Korean Society of Propulsion Engineers
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    • v.18 no.5
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    • pp.19-28
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    • 2014
  • Firing test of solid rocket motor with pintle-technology carried out and the measured pressure-time curve was compared with the values predicted by the internal ballistic and performance analysis. Without baffle, the measured combustion chamber pressure was similar with the predicted pressure at the beginning of combustion, but gradual increase in pressure, which was unexpected with the end-burning grain of which burning area is constant, was observed. A baffle was inserted to make uniform flow over the pintle. Unlike the thruster without baffle, the measured combustion chamber pressure was 1.4 times higher than the predicted value. Through the CFD simulation, 10% of total pressure loss of the flow was observed from combustion chamber to nozzle throat when the baffle was inserted. The measured pressure with baffle was predicted well by considering the total pressure loss in the internal ballistic modelling and performance analysis.

Thrust performance at the various pintle shapes and positions (핀틀 형상 및 위치에 따른 추력 성능)

  • Kim, Joung-Keun;Lee, Ji-Hyung;Jang, Hong-Been
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • 2008.11a
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    • pp.89-93
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    • 2008
  • The effect of pintle shapes and position to the thrust performance of Solid Rocket Motor was studied by experimental-aided Computational Fluid Dynamic(CFD). Among the turbulent models for RANS in Fluent, Spalart-Allmaras model was better agreement with the nozzle wall pressure distribution attained by cold-flow test than other models. When nozzle throat area was decreased, magnitude of thrust was increased. The bigger pintle size was, the more thrust of pintle tip pressure was obtained. Meanwhile the more thrust of nozzle and chamber pressure decreased. Hence, total thrust of big pintle was less than a small pintle under same throat area condition.

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A study on internal flow field of supersonic nozzle by needle type pintle position (Needle형 Pintle의 위치에 따른 초음속 노즐 내부 유동장 연구)

  • Lee, Ji-Hyung;Kim, Jung-Keun;Chang, Hong-Been
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • 2008.11a
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    • pp.269-272
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    • 2008
  • Internal flow field of supersonic nozzle with pintle, which control thrust of solid rocket motor, is very complicated by pintle tip shape and contour of nozzle. For studying of pintle nozzle performance by effects of internal flow field variation with pintle position, cold flow test and numerical analysis about needle type pintle shape were performed and results were presented in this paper. As the results of this study, three types of internal shocks exists in the pintle nozzle and oblique shock is oscillated by pintle position

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A study of unsteady characteristics on the pintle nozzle (핀틀 노즐의 비정상 특성연구)

  • Lee, Ji-Hyung;Chang, Hong-Been;Ko, Hyun
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • 2011.11a
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    • pp.662-665
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    • 2011
  • Pintle technology, which is one of the thrust control method for solid rocket motor, can control the thrust by the control of nozzle throat area through the pintle moving. For studying the unsteady flow characteristics of pintle nozzle by needle type pintle moving, cold flow test and numerical analysis were performed. The pressure distribution on the pintle tip was varied for pintle moving and stopping and thrust was varied by this effects.

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A Study on Steady State Performance of Variable Thrust Nozzle by Cold-Flow Test (공압시험을 이용한 추력가변 노즐의 정상상태 성능 연구)

  • Kim, Joung-Keun;Lee, Ji-Hyung;Oh, Jong-Yun;Chang, Hong-Been
    • Journal of the Korean Society of Propulsion Engineers
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    • v.12 no.2
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    • pp.8-14
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    • 2008
  • Solid Rocket Motor(SRM) has advantages such as - high specific impulse, operational safety and simplicity in design and manufacturing process but thrust magnitude can't be controlled. For studying of pintle nozzle that can control the thrust magnitude of SRM, cold flow test and numerical analysis about needle type pintle shape were performed and results were presented in this paper. As the results of this study, pintle tip's shape and nozzle contour were important design parameters because thrust performance and variable thrust range of pintle nozzle depend on them. Especially, the thrust of needle typed pintle nozzle adopted in this test was predicted 13% higher than normal nozzle without pintle.

A study on steady state performance of variable thrust nozzle by cold-flow test (공압시험을 이용한 추력가변 노즐의 정상상태 성능 연구)

  • Kim, Jung-Keun;Lee, Ji-Hyung;Oh, Jong-Yun;Chang, Hong-Been;Kim, Shin-Hoe
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • 2007.04a
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    • pp.289-294
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    • 2007
  • Solid Rocket Motor(SRM) has advantages such as - high specific impulse, operational safety and simplicity in design and manufacturing process, but thrust magnitude can't be controlled. For studying of pintle nozzle that can control the thrust magnitude of SRM, cold flow test and numerical analysis about needle type pintle shape were performed and results were presented in this paper. As the results of this study, pintle tip's shape and nozzle contour were important design parameters because thrust performance and variable thrust range of pintle nozzle depend on them. Especially, the thrust of needle typed pintle nozzle adopted in this test was predicted 13% higher than normal nozzle without pintle.

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