Abstract
In thermal fatigue test, the key point is whether the temperature field on the top surface of cylinder head induced by the heat source can well match it in real service. In order to produce the target temperature field in service which is measured by thermocouples, shaped laser beam generated by diffractive optics element (DOE) is chosen as the heat source to irradiate on the top surface of cylinder head. The DOE is designed based on the Gerchberg-Saxton (GS) algorithm and the simulated temperature field is calculated by finite element model (FEM). The results show that the simulated and experimental temperature field can well match the target one which demonstrates that this method is feasible to produce the target temperature field and can be used in thermal fatigue test.
Highlights
During diesel engine works in service, as one of the key parts, cylinder head is subjected to thermal fatigue due to periodic thermal loading of high temperature combustion gas, which will lead to intense stress concentration and accelerate the failure or fault of cylinder head [1]
This paper provides an effective method to simulate the real temperature field on the top surface of cylinder head in working service which is measured by thermocouples
The shaped laser beam with certain intensity distribution is chosen as the heat source to irradiate on the top surface of the cylinder head, and the simulated temperature field is calculated by finite element model (FEM) which agrees with the target temperature field
Summary
During diesel engine works in service, as one of the key parts, cylinder head is subjected to thermal fatigue due to periodic thermal loading of high temperature combustion gas, which will lead to intense stress concentration and accelerate the failure or fault of cylinder head [1]. The accuracy and reliability of thermal fatigue test depends on whether the temperature field on the top surface of cylinder head induced by the heat source can well be consistent with it in real service condition. The shaped high power laser beam with symmetric distribution has been employed in thermal fatigue test on large engine parts like pistons and cylinder heads [7]–[9]. The most studies focus on pistons and the temperature field on cylinder head induced by the shaped laser beam with symmetric distribution can’t well reflect the real temperature field in service which always is non-uniform and non-symmetric. The aim of the present paper is that the temperature field on the top surface of cylinder head loaded by shaped laser beam with certain intensity distribution can well match the target one in real service. The study will provide meaningful technical reference for the evaluation of laser thermal loading and damage on cylinder head
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