Analytic solution of temperature pattern of round heat sources is presented under the changing discharge channel radius with time and fixed input total power.

得到在随时间变化的通道半径和固定输入总功率表面热源条件下的温度场计算公式。

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The design method of U-shaped channel optimal hydraulic cross section and the calculation equation used to determine the bottom circle's radius of U-shaped channel is proposed in this paper.

提出了U形渠道水力最佳断面的设计方法，并给出了确定U形渠道水力最佳断面底弧半径的计算公式。

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Its compact structure, compact shape, small turning radius, good environmental performance and good stability characteristics, enable it to the narrow channel and limited space operations.

其结构紧凑、外形小巧、转弯半径小、环保性能好且稳定性好的特点，使它能在狭窄通道和有限空间内作业。

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