垂直微结构湍流剖面仪速度分析与控制

湍流剖面仪的下潜速度是进行湍流观测时需要重点考虑的一个参数。根据湍流剪切数据测量原理,分析下潜速度对测量结果的影响,确定下潜速度的合理范围。受力平衡条件下,湍流仪的下潜速度由仪器净重和阻力系数决定。影响整体阻力系数的因素有3个,即3个阻力分量:主体结构的冲击阻力、黏滞阻力和阻尼刷的阻力。采用理论公式与经验公式相结合,分别计算3个阻力对应的阻力系数。根据下潜速度函数,给出速度配置的方法及应该注意的事项。仪器完成后进行下潜速度配置试验,将理论计算结果和试验结果进行比较分析,验证理论计算结果的准确性。

Analysis and Control of Sinking Velocity for Vertical Microstructure Turbulence Profiler

The sinking velocity of turbulence profiler is a significant parameter for turbulence observation that should be noted necessarily. Based on measurement principles of shear data, the range of reasonable sinking velocity is adopted after a considerate analysis of the effects on measuring results brought by sinking velocity. While the profiler is in a state of force balance, the sinking velocity is determined by net weight and drag coefficient. The drag coefficient of the profiler relates to three factors, that is, the three resistances: the impact resistance and viscous resistance act on main body, and the impact resistance act on the brush. Combination of theoretical formulas and empirical formulas is used to calculate the drag coefficients of the three resistances and get a final result. According to relevance of the sinking velocity with net weight and drag coefficient, methods and matters to note of velocity configuration are given. Tests on velocity configuration of the profiler are completed for times. Comparing the theoretical results and test results, the accuracy of theoretical calculation is verified.