Numerical Study on Combustion and Heat Transfer of a GOX/GCH4 Pintle Injector

Chang, Y.R.; Zou, Jianjun; Li, Qinglian; Cheng, Peng; Zhou, Kang

doi:10.1007/978-981-13-3305-7_145

Cited by 6 publications

(1 citation statement)

References 21 publications

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“…In the present study, the physical process consists of the gas turbulent flow, combustion, and heat transfer between the gas and the pintle injector. First, the standard k-ε turbulent model is satisfactory on the simulation of the combustion gas flow according to the previous work [24], so it is selected to describe the steady-state gas flow. In addition, all of the gases can be approximately assumed to be the ideal gas.…”

Section: Governing Equationsmentioning

confidence: 99%

Experimental and Numerical Study on the Ablation Analysis of a Pintle Injector for GOX/GCH4 Rocket Engines

Chang

Zou

2023

Coatings

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In the present study, the ablation of a pintle injector on a 500N GOX/GCH4 rocket engine under different working conditions is studied experimentally and numerically. The temperature of the pintle tip and the combustion gas in the head zone was measured in a series of experiments by the thermocouples. Moreover, a three-dimensional model was established to simulate combustion and heat transfer concurrently and analyze the ablation state of the pintle injectors. The obtained results indicate that under a low chamber pressure (pc=0.25 MPa) and an increasing O/F ratio from 0.8 to 2, the tip temperature declines first, and then rises. At the designed working condition (pc=1.05 MPa and O/F = 3.2), the pintle tip suffered serious ablation, and the microstructure analysis indicates that the ablation failure of the stainless steel pintle tip originates from chromium precipitation. This phenomenon is especially more pronounced when the temperature exceeds 1273 K, which makes the structure fragile and vulnerable. This article helps to provide an understanding of the ablation failure of the pintle injectors, and the established model is capable of giving a prediction on the ablation status of the pintle tips consistent with the experiment.

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Section: Governing Equationsmentioning

confidence: 99%

Experimental and Numerical Study on the Ablation Analysis of a Pintle Injector for GOX/GCH4 Rocket Engines

Chang

Zou

2023

Coatings

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Geometric Effects of Liquid Rocket Engine Pintle Injectors in Supercritical Combustion

Hwang

Kim²,

Ryu³

et al. 2022

Int. J. Aeronaut. Space Sci.

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Effect of the Flow Passage Area Ratio on a Double Slit-Type Pintle Injector

Lee,

Shim,

Kim

et al. 2024

Int. J. Aeronaut. Space Sci.

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Due to the structural characteristics of the pintle injector, a recirculation zone is generated under the pintle, so the pintle tip is directly exposed to a high-temperature environment. Therefore, the cooling technique and protective coating on the pintle tip are essential for improving the reusability and durability of the pintle injector. Although various cooling methods are known, this study applied a forced flow passage cooling method by adding internal structures called inserts to the pintle injector. The characteristics of the insert were analyzed experimentally and numerically based on change of its area ratio. When the internal flow changes, the spray angle, droplet size, and cooling performance also change in accordance with an increase in the insert’s central area. When the insert structure is installed in the pintle post, upward flow may occur, which can worsen the spray angle and droplet distribution characteristics. Nevertheless, owing to the insert structure, the surface temperature of the pintle post is reduced dramatically as intended. Thus, an optimal design technique for cooling by changing the area ratio of the first- and second-row slits of the pintle post can be suggested to overcome the limitations of the insert structure. The results of this study will be helpful in understanding the spray characteristics of the insert structure and optimize the design of cooling channels for reusable pintle injectors in the future.

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Numerical Study on Combustion and Heat Transfer of a GOX/GCH4 Pintle Injector

Cited by 6 publications

References 21 publications

Experimental and Numerical Study on the Ablation Analysis of a Pintle Injector for GOX/GCH4 Rocket Engines

Experimental and Numerical Study on the Ablation Analysis of a Pintle Injector for GOX/GCH4 Rocket Engines

Geometric Effects of Liquid Rocket Engine Pintle Injectors in Supercritical Combustion

Effect of the Flow Passage Area Ratio on a Double Slit-Type Pintle Injector

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