海军工程大学 动力工程学院, 湖北 武汉 430033
*邮箱: liuzhenmingyk@163.com
收稿:2022-06-07,
网络首发:2023-12-15,
纸质出版:2023-10-30
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李子铭, 刘振明, 刘景斌, 等. 舰船柴油机微通道内燃油空化现象的模型对比[J]. 兵工学报, 2023,44(10):3091-3100.
Ziming LI, Zhenming LIU, Jingbin LIU, et al. Model Comparison of Fuel Cavitation Phenomena in Microchannels of Marine Diesel Engines[J]. Acta Armamentarii, 2023, 44(10): 3091-3100.
李子铭, 刘振明, 刘景斌, 等. 舰船柴油机微通道内燃油空化现象的模型对比[J]. 兵工学报, 2023,44(10):3091-3100. DOI: 10.12382/bgxb.2022.0498.
Ziming LI, Zhenming LIU, Jingbin LIU, et al. Model Comparison of Fuel Cavitation Phenomena in Microchannels of Marine Diesel Engines[J]. Acta Armamentarii, 2023, 44(10): 3091-3100. DOI: 10.12382/bgxb.2022.0498.
喷油器是舰船柴油机的关键部件
喷油器喷孔、控制腔进出油孔直径一般在 0.2~0.5mm 之间
属于典型的微通道结构。高压喷射时通道内发生的空化现象
严重影响柴油机的可靠性。湍流和空化模型的选择是使用数值计算方法研究上述空化问题的关键。基于Winklhofer微通道燃油试验
使用代表性较强的3种湍流模型和2种空化模型构建微通道模型
将仿真与试验结果对比分析。研究结果表明:重整化群(RNG)
k-ε
+Zwart-Gerber-Belamri(ZGB)模型、RNG
k-ε
+Schnerr-Sauer(SS)模型这两种组合所得的压力梯度值与试验数据相近
误差在7%以下;不同模型组合计算得到的空化分布存在差异;在19~85bar压差范围内
Realizable
k-ε
+ZGB模型、RNG
k-ε
+ZGB模型所得出口质量流量与试验数据的变化趋势吻合
且误差不到4%;截面流速计算方面
RNG
k-ε
+SS模型的计算误差最小
误差处于10%以下。
The fuel injector is the key component of the marine diesel engine
and the diameters of the injector nozzle and the control chamber oil inlet and outlet
which are typical microchannel structures
are generally between 0.2 and 0.5mm. During high pressure injection
the cavitation phenomenon in the channel seriously affects the reliability of diesel engine. The choice of turbulence and cavitation models is the key to study the above cavitation problems using the numerical calculation methods. Based on the Winklhofer microchannel fuel test
three representative turbulence models and two cavitation models were used to construct the microchannel model
and the simulated results were compared and analyzed with the test results. The results show that the pressure gradient values obtained from the two combinations of RNG
k-ε
+ZGB models and RNG
k-ε
+SS models are similar to the experimental data with an error of less than 7%; the cavitation distributions calculated by the different model combinations are different; the outlet mass flow rates obtained from Realizable
k-ε
+ZGB models and RNG
k-ε
+ZGB models are consistent with the experimental; in the range of pressure difference from 19 bar to 85 bar
and the outlet mass flow rate obtained from the Realizable
k-ε
+ZGB model and the RNG
k-ε
+ZGB model matches the trends of the experimental data
and the error is less than 4%. In the caculation of cross-sectional flow rate
the calculated error of RNG
k-ε
+SS model is minimum with the error of less than 10%.
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GIANNADAKIS E , GAVAISES M , ARCOUMANIS C . Modelling of cavitation in diesel injector nozzles [J ] . Journal of Fluid Mechanics , 2008 , 616 : 153 - 193 . DOI: 10.1017/S0022112008003777 http://doi.org/10.1017/S0022112008003777 https://www.cambridge.org/core/product/identifier/S0022112008003777/type/journal_article https://www.cambridge.org/core/product/identifier/S0022112008003777/type/journal_article A computational fluid dynamics cavitation model based on the Eulerian–Lagrangian approach and suitable for hole-type diesel injector nozzles is presented and discussed. The model accounts for a number of primary physical processes pertinent to cavitation bubbles, which are integrated into the stochastic framework of the model. Its predictive capability has been assessed through comparison of the calculated onset and development of cavitation inside diesel nozzle holes against experimental data obtained in real-size and enlarged models of single- and multi-hole nozzles. For the real-size nozzle geometry, high-speed cavitation images obtained under realistic injection pressures are compared against model predictions, whereas for the large-scale nozzle, validation data include images from a charge-coupled device (CCD) camera, computed tomography (CT) measurements of the liquid volume fraction and laser Doppler velocimetry (LDV) measurements of the liquid mean and root mean square (r.m.s.) velocities at different cavitation numbers (CN) and two needle lifts, corresponding to different cavitation regimes inside the injection hole. Overall, and on the basis of this validation exercise, it can be argued that cavitation modelling has reached a stage of maturity, where it can usefully identify many of the cavitation structures present in internal nozzle flows and their dependence on nozzle design and flow conditions.
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