钻机柴油机二级涡轮增压系统优化与流场分析

以济柴190系列柴油机的真实尺寸和实验数据为依据，对二级涡轮增压器的改造方案进行了分析，确立了二级涡轮增压器连接方案。在GT-Power中建立发动机模型并验证了模型的可靠性，在GT-Power中对二级涡轮增压器进行仿真计算并与原机涡轮增压器进行了对比分析；建立流道模型，设置合适的边界条件对二级涡轮增压系统的内部流场进行分析，分析了原增压器和二级涡轮增压系统的压气端和涡轮端的内部流场分布和运行状况。研究发现新的涡轮增压系统较原机相比的加速性能、动力性能、低转速特性都有提高，相同时间内新增压系统的进气流量更多，使燃油的燃烧更加充分，大大降低了燃油消耗率和废气中氮氧化物的含量。

Optimization and Flow Field Analysis of a Two-stage Turbocharging System for Drilling Rig Diesel Engines

Based on the actual dimensions and experimental data of Jichai 190 series diesel engines, the modification of these engines using a two-stage turbocharger was analyzed, and a scheme for installing a two-stage turbocharger in these engines was established. An engine model was constructed using the GT-Power engine simulation software, which was also used to validate the reliability of the model. A two-stage turbocharger was then simulated in GT-Power, and a comparison was performed between the two-stage turbocharger and the original turbocharger of Jichai 190 series diesel engines. A channel model was constructed with appropriate boundary conditions to analyze the internal flow fields of the two-stage turbocharging system. An analysis was then conducted on the internal flow field distribution and operating conditions of the compressor end and turbine end of the original turbocharger and two-stage turbocharging system. It was observed that the new turbocharging system results in improved acceleration performance, dynamic performance, and low rounds-per-minute (RPM) performance compared to the original engine. In addition, the increase in air intake in the new turbocharging system helps to burn fuel more thoroughly and cleanly, which greatly reduces the engine's fuel consumption rates and the NO_x content of its exhaust gases.