| 1. |
- Wang, Weishu, et al.
(författare)
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二次启动前火箭发动机泵构件温度特性数值计算
- 2005
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Ingår i: Journal of Propulsion Technology. - Beijing, China. - 1001-4055. ; 26, s. 292-295
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Tidskriftsartikel (refereegranskat)abstract
- 用数值计算的方法研究了液体火箭发动机在二次启动前,发动机泵系统各构件的温度特性和泵腔含汽率。建立了基于集总参数法的发动机启动前排放过程中涡轮、泵及进口管的温度变化计算模型。排放冷却过程中冷却剂N2O4的单相强制对流换热系数用Dittus-Boelter公式计算,流动沸腾换热系数采用ShanMM强化模型。并对某液体火箭发动机二次启动前排放过程涡轮泵系统各构件温度变化和泵腔含汽率进行了计算,模型计算结果与试车数据吻合良好,研究结果表明,二次启动前的主动排放过程对泵壳体及进口管的冷却效果很好。
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| 2. |
- Wang, Weishu, et al.
(författare)
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滑行过程中火箭发动机泵系统各构件温度数值模拟
- 2005
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Ingår i: Journal of Propulsion Technology. - Beijing, China. - 1001-4055. ; 26, s. 394-397
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Tidskriftsartikel (refereegranskat)abstract
- 利用数值计算的方法,研究了某型液体火箭发动机泵系统各构件及泵腔残余氧化剂在二次启动前滑行过程的温度变化。基于集总参数法建立了温度变化计算模型,并建立了泵腔残余氧化剂排空计算模型。计算结果与试车数据吻合良好。滑行过程中,涡轮温度下降,而泵壳体及进口管的温度升高;泵腔中残余氧化剂间歇排放。研究结果表明,滑行结束时泵系统的温度高于100℃,泵腔中残余氧化剂含汽率为1,不满足二次点火启动条件。
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| 3. |
- Yu, Sen Bin, et al.
(författare)
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旋流器出口结构对旋流火焰的影响研究
- 2019
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Ingår i: Tuijin Jishu/Journal of Propulsion Technology. - 1001-4055. ; 40:6, s. 1324-1331
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Tidskriftsartikel (refereegranskat)abstract
- To deeply understand the non-premixed swirl flame, the effects of two burner exit geometries on the non-premixed swirl flames modes were studied by performing OH-PLIF, PIV measurements and coupling LES with PDF combustion model numerically. The results showed that the stochastic PDF method can predict the swirl flow fields and detailed flame structures including local extinction. Two different quarl geometries played significant roles on the flow fields thus leading to the local extinction and lift-off. The recirculation zone is smaller in the non-quarl case which causes a more serious quenching state. Meanwhile, at the stoichiometric equivalence ratio, the OH and CH2O distributions in the no-quarl exit were broader than the quarl exit at the low temperature regime. This indicated that many low-temperature reactions took places, providing beneficial conditions for the lift-off flame stabilization.
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