Optimization of gas mixing uniformity for a V-type natural gas engine based on the pipeline in front of the compressor
In order to solve the problem of uneven gas mixing between the two cylinders of a certain V-type natural gas engine,computational fluid dynamics software is used to establish models of the front and rear pipelines of the compressor,analyze the reasons for uneven mixing,optimize the installation angle of the mixer and the structure of the intake pipeline,and conduct simulation and engine performance testing verification.The simulation results show that under the centrifugal effect generated by fluid motion,the mixture accumulates towards the inner side of the pressure front bend,resulting in uneven mixture between the two cylinders.Rotating the mixer by 45 °,and the deviation of natural gas mass fraction on both sides of the cylinder decreases from 0.195 to 0.129,indicating an improvement in mixing uniformity,but it is quite limited.The smooth transition elbow of the intake pipeline is changed to a right angle elbow,and the deviation of the natural gas mass fraction at the inlet of the two compressors on both sides is reduced from 0.195 to-0.005.The mixing uniformity is significantly improved.The performance test results of the engine before and after improvement show that after optimization,the average explosion pressure deviation in both cylinders has been reduced from 14.5％to 9.0％.There is a good agreement between the deviation of average explosion pressure on both sides of the cylinder and the deviation of natural gas mass fraction,indicating that optimizing the intake pipeline structure can significantly improve the mixing uniformity of the engine.
gasmixermixing uniformitycomputational fluid dynamicsthe pipeline in front of the compressor
NETL
NSTL
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