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翅片管束管外放熱和阻力實(shí)驗(yàn)
測(cè)試數(shù)據(jù)
表1 測(cè)試數(shù)據(jù)表
測(cè)試次數(shù)動(dòng)壓頭(Pa)靜壓(Pa)空氣溫度(℃)熱電偶測(cè)熱管蒸汽溫度—
—讀數(shù)(mV)箱溫(mV)電壓(V)電流(A)ΔPHtitot1t2t3t4t5100359.713.93.9983.6413.054.7840.3452485.89200509.812.73.7143.2122.6384.4430.3482485.9300909.912.33.5652.9372.3944.2440.3582485.914001109.811.93.4742.7862.264.1320.3582485.915001401011.73.4082.6822.1684.0530.3812485.916001609.811.43.3572.5912.0823.9850.3852485.91
物性參數(shù)的確定
管內(nèi)蒸汽溫度的確定
表2 試驗(yàn)管內(nèi)蒸汽平均溫度
熱電偶測(cè)管內(nèi)蒸汽溫度——讀數(shù)(mV)t1t2t3t4tm蒸汽溫度(℃)3.9983.6413.054.7843.86890.93.7143.2122.6384.4433.50282.93.5652.9372.3944.2443.28578.13.4742.7862.264.1323.16375.43.4082.6822.1684.0533.07873.53.3572.5912.0823.9853.00471.9
空氣平均溫度及空氣參數(shù)的確定
測(cè)試次數(shù)空氣溫度(℃)空氣物性參數(shù)入口出口平均溫度tf密度(kg/m3)出口處密度(kg/m3)比熱(J/kg.K)導(dǎo)熱系數(shù)(W/m.K)運(yùn)動(dòng)粘度(m2/s)19.713.911.81.2391.231 1005.00 0.0252 1.43E-059.812.711.251.2421.236 1005.00 0.0252 1.43E-059.912.311.11.2421.237 1005.00 0.0252 1.43E-059.811.910.851.2431.239 1005.00 0.0252 1.42E-051011.710.851.2431.240 1005.00 0.0252 1.42E-059.811.410.61.2441.241 1005.00 0.0251 1.42E-05
實(shí)驗(yàn)數(shù)據(jù)的整理計(jì)算
計(jì)算風(fēng)速和風(fēng)量
表3 風(fēng)速和風(fēng)量計(jì)算表
測(cè)試次數(shù)動(dòng)壓頭(Pa)測(cè)速處風(fēng)速(m/s)風(fēng)量 Ma(kg/s)測(cè)速外流道截面積(m2)空氣側(cè)吸熱量 (W)110012.700.380.0241583.63220017.950.531551.27330021.980.651574.08440025.360.751591.88550028.360.841441.74660031.050.921487.33其中,空氣側(cè)吸熱量:
電加熱器功率
加熱器箱體散熱
因箱體溫度很低,散熱量小,可由自然對(duì)流計(jì)算,其中,自然對(duì)流散熱系數(shù)近似取5W/m2.℃。
表4 加熱器箱體散熱量
測(cè)試次數(shù)箱 溫環(huán)境溫度(℃)箱體散熱面積箱體散熱量(W)讀數(shù)(mV)溫度(℃)0.3458.58.44*0.58*0.32=
0.74240.370.3488.98.41.860.3589.28.42.970.3589.28.42.970.3819.78.44.830.3859.88.45.2
計(jì)算熱平衡誤差
表5 熱平衡誤差表
空氣側(cè)吸熱量Q1箱體散熱量Q3功率(W) Q2熱平衡誤差%1583.630.371460.77.78451551.271.861463.25.79691574.082.971465.77.0751591.882.971465.78.1141441.744.831465.7-1.3251487.335.21465.71