考虑重力影响的高压气体吹除改进数理模型和试验对比分析

Experiment and Mathematics Model of High Pressure Air Blowing

考虑重力对吹除过程的影响,改进现有压载水舱高压气体吹除数理模型,并对原始数理模型与改进数理模型进行差异对比。通过高压气体吹除系统的模型试验,验证改进数理模型的可靠性。最后,使用改进的数理模型对影响吹除效率的因素进行分析。结果表明:在吹除系统中,当流水孔面积达到一定值时,可能出现流水孔面积增大,但流水孔的水的质量流量几乎不变的情况;当等效喷管喉部直径足够大时,高压吹除的速率与等效喷管喉部直径关系较小。

This paper improves the mathematical model for the high pressure air blowing in ballast tanks proposed by other researcher by incorporating the effects of gravity,and the difference between the original model and the improved one is presented. To verify the credibility of the improved model,an experiment of high pressure air blowing was carried out,which shows that the improved model can be well applied into the design and optimization of the blowing system. Finally,the impact of certain factors on the blowing procedure is discussed. It is observed that the mass flow rate does not increase along with raise in the outlet area when the latter reaches a certain threshold,and the blowing rate may not change much when the diameter of the nozzle throat increases to a certain value.