Improvement of the Performances of High-Speed Diesel Engines by Tuning the Intake and Exhaust Systems

通过调整进排气系统提高高速柴油机的性能

• 批准号: 61550160
• 负责人: SHIMAMOTO Yuzuru
• 金额: $ 1.34万
• 依托单位: Kyoto University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1986
• 资助国家: 日本
• 起止时间: 1986 至 1987
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-61550160/
• 关键词: Prediction of Performance; Simulation of Turbocharged Engines; Intake and Exhaust Systems; Intake Prot; Volumetric Efficiency; Three-Dimensional Flow Analysis; 三次元流動解析; 給; 排気系

By studying the methods for numerically predicting the intake and exhaust systems which can improve the performances of high-speed diesel engines, the following results were obtained:1. A simulation program for predicting the performances of turbocharged compound engines was completed. This program can predict the optimum combination of the compressor and the exhaust turbine, considering the dynamic effect of the intake and exhaust pipe systems. The usefulness of the program was confirmed through the comparison of the predicted performance of the compound engine with those of one- and two-stage turbocharged engines.2. A method which treated the intake systems simply on the basis of the analogy between the intake systems and the electrical circuits was determined. It was attempted to utilize the crankcase and the intake pipe with variable sectional area, and also attempted to utilize the free-piston type air-compressor actuated by the pressure difference between two branches of exhaust manifold. Numerical simulation showed that these devices were effective for increasing the amount of intake air.3. A practical program for calculating the three-dimensional unsteady gas flows in intake ports was developed. The calculation accuracy was examined by comparing the calculated results of steady flow with experimental ones. It was possible to calculate the changes of the swirl intensity and volumetric efficiency due to the changes of the configurations of helical ports and the temporal variation of the pressure at the inlet and outlets of an intake port with two valves. In this method, the unsteady threedimensional flow in the intake port is analyzed separately form outer regions by using the results of the one-dimensional calculation of gas-exchanging process as the inlet and outlet boundary conditions. Therefor, the effect of the port configuration on the flow characteristics can be estimated under the engine operating conditions.

通过对改善高速柴油机性能的进排气系统数值预测方法的研究，取得了以下成果：1。编制了预测涡轮增压复合发动机性能的仿真程序。该程序可以考虑进排气管系统的动态效应，预测压气机和排气涡轮机的最佳组合。通过与单级和双级涡轮增压发动机预测性能的比较，验证了程序的有效性.确定了一种基于进气系统和电路之间的类比来简单处理进气系统的方法。尝试利用曲轴箱和具有可变截面积的进气管，并且还尝试利用由排气歧管的两个分支之间的压力差致动的自由活塞式空气压缩机。数值模拟表明，这些装置对增加进气量是有效的.开发了一个实用的进气道三维非定常流动计算程序。通过定常流场计算结果与实验结果的比较，验证了计算的准确性。计算了双气门进气道螺旋进气道结构的变化以及进、出口压力随时间的变化对涡流强度和充气效率的影响。该方法将进气道内气体交换过程的一维计算结果分别作为进气道和排气道的边界条件，从外部区域分析进气道内的三维非定常流动。因此，在发动机的工作条件下，气道结构对流动特性的影响可以估计。

项目成果

Kazuhiro KANAMARU: "Computerized Simulation of Performances of a Two Stage Turbocharged Diesel Engine and Its Application" JSAE Review. 7. 20-26 (1986)

Kazuhiro KANAMARU：“两级涡轮增压柴油机性能的计算机模拟及其应用”JSAE 评论。

Yuzuru SHIMAMOTO: "An Attempt to Improve the Characteristics of Volumetric Efficiency by a Resonator in Four Cycle Diesel Engines (in Japanese)" Trans. Japan Soc. Mech. Engrs., Ser. B. 52. 2487-2494 (1986)

Yuzuru SHIMAMOTO：“通过四冲程柴油发动机中的谐振器提高容积效率特性的尝试（日语）” Trans。

嶋本譲: 日本機械学会論文集(B編). 52. 1997-2003 (1986)

Yuzuru Shimamoto：日本机械工程师学会会议记录（B 版）52。1997-2003（1986）。

脇坂和行: 日本機械学会論文集(B編). 52. 1555-1564 (1986)

Kazuyuki Wakisaka：日本机械工程师学会会议记录（B 版）52。1555-1564（1986 年）。

嶋本譲: 日本機械学会論文集(B編). 52. 2449-2456 (1986)

Yuzuru Shimamoto：日本机械工程师学会会议记录（B 版）52. 2449-2456 (1986)。