Estimation of instantaneous local heat transfer coefficient in spark-ignition engines |
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| Authors: | A Mohammadi M Yaghoubi |
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| Affiliation: | 1. Mechanical Engineering Department, K. N. Toosi University of Technology, Tehran, Iran;2. Mechanical Engineering Department, Shiraz University, Shiraz 71348-51154, Iran;1. Graduate Program in Chemical Engineering, Universidade Federal de Santa Maria, Brazil;2. Mechanical Engineering Department, Universidade Federal de Santa Maria, Brazil;1. State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body, Hunan University, Changsha 410082, China;2. Key Laboratory of Advanced Manufacture Technology for Automobile Parts (Chongqing University of Technology), Ministry of Education, Chongqing 400054, China;3. Division of Aerospace Engineering, College of Engineering, Nanyang Technological University, Singapore 639798, Singapore |
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| Abstract: | Optimizing heat transfer for internal combustion engines requires application of advanced development tools. In addition to experimental method, numerical 3D-CFD calculations are needed in order to obtain an insight into the complex phenomenas in-cylinder processes. In this context, fluid flow and heat transfer inside a four-valve engine cylinder is modeled and effects of changing engine speed on dimensionless parameters, instantaneous local Nusselt number and Reynolds number near the surface of combustion chamber are studied. Based on the numerical simulation new correlations for instantaneous local heat transfer on the combustion chamber of SI engines are derived. Results for several engine speeds are compared for total heat transfer coefficient of the cylinder engine with available correlation proposed by experimental measurements and a close agreement is observed. It is found that the local value of heat transfer coefficient varies considerably in different parts of the cylinder, but it has equivalent trend with crank angle position. |
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