A fluid-structure coupling model was
established and verified for the heat transfer process of the cylinder liner of
opposed-piston two-stroke
diesel engine under the calibration working conditions. Based on the key
geometric and operational parameters of the cylinder liner and the cooling
water cavity, the reasonable parameter value range was determined, and the
orthogonal test design combined with simulation calculation was used for
optimization analysis. Taking the cooling water flow rate, cylinder liner
temperature and other key characteristics as evaluation indicators, the signaltonoise ratio analysis and range analysis
were carried out to ensure that all evaluation indicators reached the optimum.
Finally, the optimal parameter combination scheme was obtained, and a
comprehensive comparison and analysis were made between the optimized scheme
and the initial scheme. The optimized model significantly improved the flow
characteristics of the cooling water, and the cooling water flow rates at the near
and far ends of the water inlet in the combustion chamber area increased by
170% and 79%, respectively. Meanwhile, the pressure level on the water inlet
side of the cooling water cavity reduced after optimization, resulting in a
loss of 3.5% decrease in pressure loss and enhanced uniformity of pressure
distribution. The optimized design effectively reduced the overall temperature
of the high heat load area, and the maximum temperatures in the combustion
chamber and exhaust port areas decreased by 34.5 K and 17.6 K, respectively. In
addition, the overall heat transfer capacity of the key heat load area
enhanced, and the heat transfer coefficient in the combustion chamber area
increased by 47%, while the heat transfer coefficient in the exhaust port area
slightly decreased by 4% relative to the baseline model, yet still fully met
the design requirements. The research results show that the optimization scheme
is effective and provides an important basis for the design and optimization of
cylinder liner and cooling structure.
ZHANG Kai, MA Fukang, ZHU Yan, SONG Yijie, ZHANG Xiaofeng
. Optimization of Cooling Performance for Cylinder Liner
of Opposed-Piston Two-Stroke
Diesel Engine[J]. Vehicle Engine, 2025
, 0(6)
: 29
-38
.
DOI: 10.3969/j.issn.1001-2222.2025.06.005
