基于实测的螺旋风管沿程阻力计算方法
Calculation method for along-duct resistance of spiral ducts based on experimental measurements
摘要：
利用国家认可的实验室风量检测台,对螺旋风管基本系列17种规格样品的沿程阻力进行了测试,得到了不同风速下不同规格螺旋风管的沿程阻力实测值。参照ANSI/ASHRAE Standard 120-2008,采用最小二乘法对实测值进行拟合,得到了17个螺旋风管沿程阻力算式。使用数理统计方法分析得出了这些算式的相关关系,对各算式数值优化整理后采用最小二乘法再次拟合,最终将17个算式拟合为1个可适用于全系列规格螺旋风管沿程阻力计算的通用算式。计算结果表明,采用拟合通用算式计算得到的螺旋风管沿程阻力值与实测值相比平均误差小于3%,精度满足设计计算要求。
Abstract：
Using a nationally accredited laboratory airflow testing facility, the along-duct resistance for a fundamental series of 17 spiral duct samples is tested, and the measured values for the along-duct resistance of these 17 spiral ducts under different wind speeds are obtained. Referring to ANSI/ASHRAE Standard 120-2008, the measured values are fitted by the least square method, and 17 along-duct resistance formulas of spiral ducts are obtained. The correlations between these formulas are obtained by mathematical statistical methods. After further optimization and consolidation of the formula values, they are once again fitted using the least square method. Ultimately, these 17 formulas are fitted into a universal formula applicable for calculating along-duct resistance in spiral ducts of all specifications. The calculation results show that the average error of the along-duct resistance value of spiral ducts calculated by fitting the universal formula is less than 3% compared with the measured value, and the accuracy meets the design calculation requirements.
Keywords:experimental measurement; spiral duct; along-duct resistance; calculation method; mathematical statistic; universal formula