船体后和开放水域护柱拉力条件下螺旋桨推力系数差异的来源

V. Kotlovich
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引用次数: 0

摘要

研究对象和目的。研究对象是自航船舶在系柱牵引条件下的试验结果。目的是分析在开放水域和船尾条件下引起螺旋桨推力系数差异的水动力源。材料和方法。基于理想螺旋桨理论的分析表明,在系柱牵拉条件下,在保证水流附着于船体表面的沉池系统下,运行在船体后的螺旋桨上的入流速度ΔV具有有限值,实际上是有效尾流。开放水域螺旋桨的尾流速度等于船尾速度。开放水域螺旋桨在推进比下的推力系数(公式)是由于其反转的反向射流。结果表明,开放水域自航试验时的推力系数偏差与船柱牵引工况附近作业区域螺旋桨推力变化的特点有关。定义了自航试验中对向射流对螺旋桨曲线影响的操作区域边界。根据所获得的数据,给出了以下实际结论和建议。主要的结果。找到了开放水域螺旋桨在系柱牵引条件下与封闭工况下自航试验结果不一致的原因。提出了更新螺旋桨和自航模型试验规程的建议。希望本文能对理解自行式试验结果的模糊性有所帮助。
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Sources of differences between propeller thrust coefficients in bollard-pull conditions behind ship hull and in open water
Object and purpose of research. The object of research is the results of self-propelled ship tests in bollard-pull conditions. The purpose is to analyse the hydrodynamic sources giving rise to differences between propeller thrust coefficient in open-water and behind-hull conditions. Materials and methods. Analysis based on the ideal propeller theory shows that the velocity ΔV of inflow on propeller operating behind ship hull in bollard-pull conditions caused by a system of sinks, ensuring flow attachment to hull surface, has a finite value and is actually the effective wake. The wake velocity for an open-water propeller is equal to the behind hull velocity. The open-water propeller thrust coefficient at advance ratio (formula) is due to the opposed jet of its reversal. It is shown that the thrust coefficient deviations at self-propelled tests in open-water has to do with the specifics of propeller thrust variations in the operating area adjacent to bollard-pull conditions. Boundaries of the operating area where the opposed jet affects the propeller curve at self-propelled tests are defined. Practical conclusions and recommendations are given following from the obtained data. Main results. The source of discrepancies between self-propelled test results for open-water propeller in bollard pull conditions and close operating area has been found. Recommendations are given on updating the test procedures for propeller and self-propelled model tests Conclusion. The paper is expected to be useful for understanding the ambiguity of self-propelled test results.
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