• CN:11-2187/TH
  • ISSN:0577-6686

机械工程学报 ›› 2019, Vol. 55 ›› Issue (10): 226-232.doi: 10.3901/JME.2019.10.226

• 交叉与前沿 • 上一篇    

气液混合流体的体积弹性模量理论模型研究

袁晓明1,2, 王储1,2, 赵士宜1,2, 张立杰1,2   

  1. 1. 燕山大学河北省重型机械流体动力传输与控制重点实验室 秦皇岛 066004;
    2. 燕山大学先进锻压成形技术与科学教育部重点实验室 秦皇岛 066004
  • 收稿日期:2018-11-09 修回日期:2019-02-27 出版日期:2019-05-20 发布日期:2019-05-20
  • 通讯作者: 张立杰(通信作者),男,1969年出生,博士,教授,博士研究生导师。主要研究方向为液压测控技术、机器人技术和电磁发射器设计与优化。E-mail:ljzhang@ysu.edu.cn
  • 作者简介:袁晓明,男,1984年出生,博士,讲师,硕士研究生导师。主要研究方向为电磁发射器设计与优化、离散元技术及应用和流体传动与控制。E-mail:xiaomingbingbing@163.com
  • 基金资助:
    国家自然科学基金(51805468)、河北省自然科学基金(E2017203129)、燕山大学基础研究专项(16LGB001)和燕山大学博士基金(B934)资助项目

Investigation on Bulk Elastic Modulus of Air and Liquid Mixing Fluid

YUAN Xiaoming1,2, WANG Chu1,2, ZHAO Shiyi1,2, ZHANG Lijie1,2   

  1. 1. Hebei Key Laboratory of Heavy Mechinery Fluid Power Transimission and Control, Yanshan university, Qinhuangdao 066004;
    2. Key Laboratory of Advanced Forging & Stamping Technology and Science, Yanshan University, Qinhuangdao 066004
  • Received:2018-11-09 Revised:2019-02-27 Online:2019-05-20 Published:2019-05-20

摘要: 气液混合流体的体积弹性模量是流体本身的物理性质,直接影响流体传动的准确性、快速性和稳定性。建立准确的气液混合流体体积弹性模量理论模型是实现流体机械设计和优化的基础,具有重要的理论和工程应用价值。通过分析流体空化演变过程,在亨利定律的基础上,运用五次多项式法建立流体内气相组分含量与压力间的数学模型,推导出气液混合流体体积弹性模量理论模型(Model1)。结合物理试验样本数据,选取三种流体体积弹性模量理论模型与Model1的计算结果进行对比,并分析初始含气量和流体压力对气液混合流体体积弹性模量的影响规律。研究结果表明:Wylie与Nykanen模型在等温条件下的体积弹性模量差别很小,在全压力范围内的体积弹性模量均比较接近;Ruan模型在高压区的体积模量预测结果偏大,而在低压区与Wylie模型比较接近;所建立的Model1模型的体积弹性模量预测结果与物理试验实测点更接近,且在考虑低压区流体呈现气态特性的基础上,给出了更加准确的低压区气液混合流体体积弹性模量预测方法。本项研究可为建立准确的气液混合流体体积弹性模量理论模型提供参考。

关键词: 饱和蒸汽压, 空化, 理论模型, 气液混合流体, 体积弹性模量

Abstract: The bulk elastic modulus of the air and liquid mixing fluid is the inherent physical property, and it has direct effects on the accuracy, rapidity and stability of fluid driving. An accurate model to calculate the bulk elastic modulus is the basis for the design and optimization of the fluid machinery, and it is of great value to the theory and engineering. By analysing the evolution process of the cavitation in the fluid and Henry's law, a quintic polynomial is proposed to fit the theoretical relationship air content and pressure, and then a theoretical model (Model1) to calculate the bulk elastic modulus of the air and liquid mixing fluid is obtained. Compared with the experimental date, the results of different models are analysed and the effects of the pressure and air content on the fluid bulk elastic modulus are revealed. The investigation shows that Wylie and Nykanen models have a little difference under isothermal conditions, and the bulk elastic modulus of both are approximate within the full pressure range; the values of Ruan model are larger within high pressure range and close to the values of Wylie model within low pressure range; the values of Model1 is the closest model to the experimental data, and it provides a more accurate method to predict the bulk elastic modulus of the fluid within law pressure range, in which the liquid phase will turn into gas phase. The investigation will provide the reference to a better prediction of the bulk elastic modulus of the air and liquid mixing fluid.

Key words: air and liquid mixing fluid, bulk elastic modulus, cavitation, saturated vapor pressure, theoretical model

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