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本文运用辨识理论和数理统计方法得到了过热蒸汽重度的解析表达式A:ρ(t,p)=-0. 339653072+6. 34045381×10~(-4) t+0. 113333377p+85. 9798372(p/t);B:ρ(t,p)=-4. 90630228×10~(-3) +3. 83867216×10~(-5) t+0. 131872041p+72. 2266428(p/t)+86. 2479109(p/t)~2(320℃≤t≤450℃,7≤p≤25kgf/cm~2) .A 式的相对误差 CE<1%,绝对误差E<0. 07kg/m~3;B 式的 CE<0. 532%,E<0. 05kg/m~3. 两式的线性相关系数 R 均大于0. 9999. 获得上述两式,将使利用微型计算机计算过热蒸汽流量的温度压力补偿更加方便,也将显著地提高计算精度。
In this paper, the analytic expression of superheated steam severity A is obtained by using the theory of identification and the method of mathematical statistics. Ρ (t, p) = -0.39653072 + 6. 34045381 × 10 -4 t +0.13333377p +85. 9798372 (p / t); B: ρ (t, p) = -4.90630228 × 10 -3 +3 .83867216 × 10 -5 t +0.131872041p + 72.266428 p / t ) +86. 2479109 (p / t) ~ 2 (320 ℃ ≤ t ≤ 450 ℃, 7 ≤ p ≤ 25kgf / cm ~ 2) .A relative error CE <1%, absolute error E < 999%, E <0 05kg / m ~ 3 linear correlation coefficient R of both more than 0. 9999. Obtaining the above two equations will enable the use of a microcomputer to calculate the superheated steam Flow temperature and pressure compensation more convenient, will also significantly improve the calculation accuracy.