The effect of geometrical parameters of jet impingement on indented protrusion absorber in double-pass solar heat collector (DPSHC) was investigated. For fixed optimum values of protrusion parameters namely arc angle (α_p), relative height ratio (e_p/D_h), and relative pitch ratio (p/D_h), four different jet height ratios (H_ji/D_h) ranging from 0.11 to 0.44 have been used with varying streamwise pitch (X_ji/D_h) and spanwise pitch ratio (Y_ji/D_h). At a constant jet diameter ratio (D_ji/D_h), the Reynolds number (Re) of the airflow fluctuated between 2500 and 22500. It has been found that the H_ji/D_h plays an important role in the performance of DPSHC and that the maximum value of the Nusselt number (Nu_dp) = 544 with friction factor (ff_dp) = 0.206 was obtained at X_ji/D_h =1.32, H_ji/D_h =0.22, and Y_ji/D_h =1.32. The investigation reveals that the thermohydraulic performance (η_dp) of the DPSHC increases as the Re increases from 2500 to 15000 and after that from 15000 to 22500 it starts to decline. The optimum value of η_dp = 3.86 has been found corresponding to Re = 15000, H_ji/D_h =0.22, X_ji/D_h =1.32, and Y_ji/D_h =1.32. Nu_dp and ff_dp correlations were developed in terms of jet impingement parameters and the selected range of Re which can be useful for estimating the performance of a DPSHC with the combined technique. The optimum deviation in the Nu_dp and ff_dp values was ±10%, which correlated well with the experimental results.

研究了射流冲击几何参数对双通道太阳能集热器（DPSHC）中锯齿状突起吸收器的影响。对于固定的突出参数最佳值，即弧角（α _p）、相对高度比（e _p /D _h）和相对节距比（p/D _h），四种不同的射流高度比（H _ji /D _h）不等从 0.11 到 0.44 已用于不同的流向节距(X _ji /D _h )和展向节距比(Y _ji /D _h ). 在恒定的射流直径比 ( D _ji /D _h ) 下，气流的雷诺数 ( Re ) 在 2500 和 22500 之间波动。已经发现H _ji /D _h对 DPSHC 的性能起着重要作用，在X _ji /D _h =1.32、H _ji /D _h =0.22 和 Y _ji /D _h =1.32处获得Nusselt 数的最大值 ( Nu _dp ) = 544，摩擦系数 ( ff _dp ) = 0.206 . 调查表明，热工水力性能（ DPSHC 的η _dp ) 随着Re从 2500 增加到 15000 而增加，之后从 15000 到 22500 开始下降。 已发现η _dp = 3.86的最佳值对应于Re = 15000、H _ji /D _h =0.22、X _ji /D _h =1.32和Y _ji /D _h =1.32。Nu _dp和ff _dp相关性是根据射流冲击参数和Re的选定范围开发的这对于使用组合技术估计 DPSHC 的性能很有用。Nu _dp和ff _dp值的最佳偏差为±10%，这与实验结果很好地相关。