关键词: 振荡热管;二元混合工质;传热特性;热阻

Abstract: The freight wagon wheel profiles and rail profiles of different wear stages are tracked and measured by the wheel-rail profile admeasuring apparatus from Datong-Qinhuangdao Heavy haul line. The typical wheel-rail profiles are selected and the finite element method(FEM) models of wheel-rail contact are established when the flange gets close to the rail in the curve segment. The elastic-plastic analysis of the FEM models is presented. The results show that under the same loading condition, with the abrasion of wheel flanges, the wheel-rail contact areas increase at first and then decrease. The root of wheel flange is worn severely at preliminary stage, and the wear gradually extends to the entire wheel flange. Starting with the wheel profile III, wheel flange and tread are worn evenly. The wheel flange wear gets into the relatively stable stage until the abrasion limit. When contacting with different stages of wheel profiles in curve, the equivalent stresses of the stable stage of worn rails are obviously smaller than that of the standard rails. Furthermore, the stable stage of worn rails could significantly improve the stress distribution when the flange gets close to the rail in the curve segment, and the wheel-rail contact stresses decrease, which can relatively reduce the abrasion of wheel and rail. Taking all the factors above into consideration, such as the wheel-rail contact area, contact stress and its distribution, the composite indicator of wheel profile III is relatively better.

Key words: heavy haul;wheel flange wear;finite element method;wheel-rail contact;curve rail