Abstract
In recent years, improving the engine fuel economy is strongly required. To enhance the engine thermal efficiency, it is important to improve the engine anti-knock quality and to decrease the engine cooling heat loss. To keep the compatibility with improving the anti-knock quality and reducing the cooling heat loss, it is important to analyze the thermal flow in the engine. This paper describes the thermal flow in the engine by using CAE and a single cylinder engine. It is shown that CAE can simulate engine thermal flow quantitatively. CAE can also demonstrate that cooling the upper part of the liner on exhaust side gives large effect on improving the anti-nock quality. This result is certified by conducting some tests with a single cylinder engine.
