Effects of Ring Pack Friction Heat on Temperature Fields of Piston Set-Liner
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ght © 2020 KSAE/ 11822 pISSN 12299138/ eISSN 19763832
EFFECTS OF RING PACK FRICTION HEAT ON TEMPERATURE FIELDS OF PISTON SET-LINER Long Zhou1)*, Guang Hua Sun1), Ying Ying Guo1) and Min Li Bai2) School of Mechanical and Power Engineering, Henan Polytechnic University, Jiaozuo 454000, China 2) School of Energy and Power Engineering, Dalian University of Technology, Dalian 116023, China
1)
(Received 26 August 2019; Revised 24 November 2019; Accepted 10 March 2020) ABSTRACTTo investigate the temperature fields of piston set-liner under the friction heat of ring pack, it is established a friction heat allocation model of ring pack based on the heat transfer theory of semi-infinite body. In this model, the piston ring, lubrication film and liner are treated as a three-layer medium. Furthermore, the distribution model of ring pack friction heat, the unsteady heat-mixed lubrication and friction model of piston ring-liner, and the heat transfer model of piston assembly-liner are also built and coupled with the allocation model to develop a coupled heat transfer model of piston set-liner. Employing the model for 6110 diesel engine, the effects of ring pack friction heat on the temperature fields of piston set-liner are simulated. Numerical results demonstrate that the friction heat allotted to the piston ring, lubrication film and liner accounts for nearly 47 %, 21 % and 32 % of ring pack friction heat, respectively. Due to the effects of friction heat, the maximum temperature rises on the piston ring, piston and liner surfaces run approximately up to 8.5 ℃, 5 ℃ and 5 ℃, separately. The established allocation and distribution models related to friction heat in this paper can be applied to any type of piston set-liner and provide the theoretical foundation for the optimal design of piston ring-liner. KEY WORDS : Ring pack, Friction heat, Allocation, Distribution, Piston set-liner
NOMENCLATURE a b c1, c2 cp e F h h0 · h hT k p p1 pa pe pi, p0 q, Q qf q
r R
s1 s2 s3 t t T T0, T Tm u w W x, y, z xc xi, x0 x
: thermal diffusivity : axial height of piston ring : correlation parameters : specific heat of lubricant : element : friction force : nominal film thickness : minimum oil film thickness : first-order derivative of oil film thickness : mean film thickness : heat conductivity : lubricant pressure : gas pressure at inter-ring : asperity contact pressure : piston ring tension : gas pressures corresponding to the leading and trailing positions : friction heat : friction heat acquired by piston ring or liner : mean friction heat of any element on piston ring or liner : radial coordinate : inner radius of liner
: back area of piston ring : bearing area : bearing area of p0 : time : time interval : temperature : boundary temperatures of the medium : mean oil film temperature : piston velocity : resultant force of node : resultant force of the whole piston ring : space coordinates : rupture location of lubrication film : inlet and outlet positions of lubrication film : axial tolerance
GREEK SYMBOLS : space coordinate
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