Determination of empirical formula for instantaneous heat transfer coefficients in a S. I. engine

Title & Authors
Determination of empirical formula for instantaneous heat transfer coefficients in a S. I. engine
Han, Seong-Bin; Gwon, Yeong-Jik; Lee, Jeong-Yeol;

Abstract
A new empirical formula for instantaneous heat transfer coefficients was determined. The determination of this formula is in need for prediction of instantaneous value of heat transfer coefficients to analyze in more detail the time variation of heat transfer rate from gas to wall in combustion chamber of a spark ignition engine. As the result, following formula was determined. h=687 $\small{p^{0.75}}$ $\small{U^{0.75}}$ $\small{D^{0.25}}$ - $\small{T^{-0.465}}$ U(.theta.)=O.494 $\small{V_{p}}$ +0.73*10$\small{^{6}}$ (1.35 p dV/d.theta.+V dp/d.theta.) Using this empirical formula, the instantaneous heat transfer coefficients of gas in the combustion chamber of spark ignition engine was predicted and compared with experimental values.
Keywords
Instantaneous Heat Transfer Coefficient;Empirical Formula;Heat Flux;Instantaneous Temperature;
Language
Korean
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