分会场

高效清洁燃烧

摘要

The Wankel rotary engine (WRE), owing to its unique motion mechanism, differs from the traditional reciprocating engine in characteristics of fluid flow and combustion within cylinders. With an aim to investigate the flow and combustion processes inside WRE, a rotation vector (RV) approach is proposed. The modelling tactics of reciprocating diesel engines is adopted in the approach, considering the unique motion mode of the WRE. Particularly, there are 2 rotating vectors used to describe the unique motion of the rotor inside the WRE. Taking a diesel rotary engine as an example, the modelling process of the three-dimensional computational fluid dynamic (CFD) model is described in detail by using this RV approach, based on a parametric geometry model of the WRE. Several measures have been taken to improve the computational efficiency of the numerical model, such as a model reduction strategy and a dynamic mesh control strategy. The accuracy of the numerical model is improved by coupling with a one-dimensional simulation model, which is established through equating the rotor engine with a three-cylinder reciprocating engine. Results reveal that the computing efficiency are boosted by using the RV approach and coupling with the one-dimensional model. It reduces computation time by 98 hours with a boost of efficiency by 43.95% to integrate the model reduction strategy and the dynamic mesh control strategy, meanwhile guaranteeing that the results error is within 5% compared to experimental data of the overall combustion processes. The movement process and change law of the flow field and combustion in the cylinder that could be acquired using the RV approach are consistent with the flow and combustion characteristics of the WRE.This RV approach proves an efficient research tool for investigating the flow and combustion processes inside WRE.

关键词

Wankel rotary engine; numerical simulation approach; parametric model; motion law; computational efficiency

电子U盘全文仅限大会已缴费参会代表下载。

您还没有登录，请您先 点击这里登录