旋转射流式高速抗冲磨试验参数的确定

本文针对旋转射流式混凝土抗悬移质冲磨试验机,采用正交设计试验,考察了流速、含砂率、冲磨时间对冲磨试验结果的影响;通过改变出水叶轮半径,考察了冲磨角对试验结果的影响。确定了冲磨效率最优的试验参数为:流量2.8L/s、水流流速40m/s、含砂率7%、冲磨时间4h、冲磨角34.6°。用该试验参数进行试验,混凝土磨损效率较DL/T 5150-2001中圆环法提高了约50倍;冲磨后混凝土试件表面破坏形态与实际工程中破坏形态接近。

Determination of test parameters of an abrasion resistance test method with high speed rotating jet flow

For the optimization of an abrasion resistance test method with high speed rotating jet flow, this paper used orthogonal experimental design method to examine the influences of flow velocity, sand content, and abrasion time on test results, and examined the effects of the jet flow angle on test results by varying the radius of the outflow impeller. The optimal abrasion test parameters were determined as follows: flux 2.8L/s, jet velocity 40m/s, sand content 7%, abrasion time 4h, and jet flow angle 34.6°. Tests conducted under this condition exhibited an efficiency about 50 times higher than that of the standard ring method according to DL/T 5150-2001, and the damage pattern of the specimen surfaces was similar to that in-situ.