平行平板流路に置かれた単一角柱の圧力損失(熱工学,内燃機関,動力など)

概要

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Pressure loss of a rectangular block on the wall of parallel channel was measured. The height of the channel B was constant 30 mm. The side length and height, C and H, of the rectangular block were varied from 30 to 180 mm and from 3 to 20 mm, respectively. The mean velocity of the channel ranged from 6 to 10 m/s. The effects of the opening ratio β=1-H/B and the side/height ratio C/H on the pressure loss coefficient ζwere measured. The pressure loss coefficient can be formulated by introducing the governing factor δ=(1-β)/β^2 as follows: ζ=1.2δ^1.25 (C/H)^0.09 for β<2/3 and ζ=1.1δ^0.8 (C/H)^0.09 for β≧2/3. And the recommended equation agrees with the experimental data within 8%. The pressure drop on the sudden contraction and the pressure rise on the sudden expansion agree with those of ordinary data for double steps.
社団法人日本機械学会の論文
2002-11-25