离心式压缩机性能图处理,内燃机运行循环模拟

D. Minchev, R. Varbanets
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引用次数: 0

摘要

没有对增压器运行参数的正确估计,就不可能对增压内燃机运行周期进行仿真。标准的方法是使用专门准备的涡轮增压器的压气机和涡轮的性能图,这是基于实验(或制造商)的原始数据。离心式压缩机性能图的插值、外推和处理具有挑战性,因为在压缩机节流、旋转失速和泵送喘振等特殊条件下获得正确的模拟非常重要。同时,获得快速稳定的发动机工作周期计算也很重要。闪电战pro -在线内燃机运行周期模拟服务-提供增压器性能图预处理和实施。它在计算过程中提供了三种不同的压气机喘振模式:1)使用Moore-Greitzer方法的全尺寸喘振模式;2)温和喘振模式,调节灵活;3)“稳定”模式,忽略喘振,用双曲方程将压气机等速线从旋转失速点延伸到低质量流区。以MAN 8G70ME-E发动机12140 kW, 82 rpm工作点为例,对考虑压气机喘振的三种模式的计算结果进行了比较。“稳定”模式提供了最快和最稳定的计算,而全尺寸喘振模式下的计算可能会产生计算的数值(非物理)不稳定性,这是由二冲程发动机对气体交换过程的高灵敏度引起的,如图所示。温和喘振模式提供了足够快速和稳定的计算,并具有喘振考虑能力,可以认为这是给定实例的最佳解决方案。研究人员应根据计算任务在离心式压缩机喘振的三种模式中进行选择,选择“稳定”模式进行初始模型建立,选择温和喘振模式进行喘振概率校核,而压缩机喘振的精确仿真还有待进一步发展。
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CENTRIFUGAL COMPRESSOR PERFORMANCE MAPS TREATMENT FOR INTERNAL COMBUSTION ENGINES OPERATING CYCLE SIMULATION
Simulation of the supercharged internal combustion engines operation cycle is impossible without correct estimation of the supercharger operating parameters. Standard approach is to use specially prepared performance maps of compressor and turbine of the turbocharger, which are based on the experimental (or manufacturer’s) raw data. Centrifugal compressor performance maps interpolation, extrapolation and treatment provides challenging requirements as it is important to get correct simulation under such special conditions as compressor choke, rotating stall and pumping surge. At the same time it’s important to obtain the fast and stable calculations of the engine’s operating cycle. Blitz-PRO – online internal combustion engines operating cycle simulation service – offers supercharger performance maps preprocessing and implementation. It provides three different modes of compressor surge consideration during calculations: 1) full-scale surge mode using Moore-Greitzer approach; 2) mild surge mode with flexible adjustment; 3) “stable” mode, when the surge is neglected and the compressor constant-speed lines are extended from the rotating stall point to the lower mass flow region with the hyperbolic equation. Using the MAN 8G70ME-E engine 12140 kW, 82 rpm operating point as an example, the calculation results are compared for three modes of compressor surge consideration. The “stable” mode provides the fastest and the most stable calculations, while the calculations under the full-scale surge mode could generate the numerical (nonphysical) instability of calculations, which are caused by the high sensitivity of the two-stroke engines to the gas exchange processes as it is shown. The mild surge mode provides fast and stable enough calculation with the surge consideration ability, which could be assumed as the best solution for the given example. The researcher should choose between provided three modes of the centrifugal compressor surge consideration according to the calculations tasks, preferring “stable” mode for initial model setup and mild surge mode for the surge probability check, while the accurate compressor surge simulation needs further development.
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来源期刊
CiteScore
1.00
自引率
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发文量
3050
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