航天推进技术研究院主办
[1]高琦翔,孙 虎,王焕燃,等.反压对收口型离心喷嘴液膜厚度的影响[J].火箭推进,2023,49(03):83-89.
GAO Qixiang,SUN Hu,WANG Huanran,et al.Effect of backpressure on liquid film thickness of close-end swirl injector[J].Journal of Rocket Propulsion,2023,49(03):83-89.
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GAO Qixiang,SUN Hu,WANG Huanran,et al.Effect of backpressure on liquid film thickness of close-end swirl injector[J].Journal of Rocket Propulsion,2023,49(03):83-89.
反压对收口型离心喷嘴液膜厚度的影响
《火箭推进》[ISSN:1672-9374/CN:CN 61-1436/V]
卷:
49
期数:
2023年03期
页码:
83-89
栏目:
目次
出版日期:
2023-06-25
- Title:
- Effect of backpressure on liquid film thickness of close-end swirl injector
- 文章编号:
- 1672-9374(2023)03-0083-07
- 关键词:
- 离心喷嘴液膜厚度背压电导法经验公式
- 分类号:
- V434
- 文献标志码:
- A
- 摘要:
- 离心喷嘴液膜厚度是影响喷嘴喷注雾化效果的主要参数之一。对不同背压环境下收口型离心喷嘴内液膜厚度的影响进行了研究。通过搭建反压喷注系统,利用电导法对收口型离心喷嘴液膜厚度进行测量,采用陶瓷针规对获得的电压值标定从而得到液膜厚度值,所得液膜厚度不确定度为0.017 mm。通过高压舱为喷嘴提供喷注环境,测量不同喷注压降和反压下的液膜厚度,从而得出结论:随着喷注压降的升高,离心喷嘴液膜厚度呈变薄趋势 反压的增加会导致气体密度的增加,使离心喷嘴内空气涡与液膜界面摩擦作用加剧,导致了液体速度下降,在相同质量流率的情况下,促使液膜厚度变大。将实验所得常压环境下的液膜厚度值与经验公式估算值比较,验证了测量结果的准确性 通过在现有液膜厚度理论公式的基础上引入反压项,提出一个全新的液膜厚度经验公式。
- Abstract:
- The liquid film thickness of swirl injector is one of the main parameters affecting the atomization effect of the injector. In this paper, the effect of different back pressures on the thickness of liquid film in close-end swirl injector was studied. By setting up a back pressure injection system, the liquid film thickness of close-end swirl injector was measured by conductivity method, and the obtained voltage value was calibrated by ceramic needle gauge to obtain the liquid film thickness value. The uncertainty of liquid film thickness is 0.017 mm. The injection environment was provided for the nozzle through the high-pressure chamber, and the liquid film thickness under different injection pressure drop and backpressure was measured. It is concluded that the liquid film thickness of swirl injector tends to become thinner with the increase of injection pressure drop. The increase of backpressure will increase the gas density, intensify the friction between the air vortex and the liquid film interface in the swirl injector, reduce the liquid velocity, and make the liquid film thickness thicker under the same mass flow rate. The accuracy of the measurement results was verified by comparing the liquid film thickness under atmospheric pressure with the estimated value of empirical formula. Based on the existing theoretical formula of liquid film thickness, a new empirical formula of liquid film thickness is proposed by introducing the backpressure term.
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备注/Memo
收稿日期:2022-05-10 修回日期:2022-06-24
基金项目:国家自然科学基金项目(U1837211)
作者简介:高琦翔(1998—),男,硕士,研究领域为液体火箭发动机喷雾燃烧及喷嘴动力学。
通信作者:富庆飞(1983—),男,博士,教授,研究领域为液体火箭发动机喷雾燃烧。
更新日期/Last Update:
1900-01-01