This study investigated the heat transfer of impinging jet arrays fed by a quadrate pipe on a ribbed surface of a high-pressure turbine case. Three models were experimentally analyzed: a row of vertical jets on a flat surface, a row of 45° jets on a ribbed surface, and a row of 45° jets combined with a row of vertical jets on the ribbed surface. Tests were conducted by the jet Reynolds number (2000–20,000), jet-to-plate spacing ( 6 d 10 d , where d is the jet diameter), and jet-to-jet spacing ( 6 d 12 d ). Results indicate that the ribbed surface greatly enhances the local Nusselt number around the impinging stagnation region. A confined channel is formed by the ribbed surface and quadrate pipe, resulting in an asymmetrical Nusselt number distribution. The spanwise-averaged Nusselt number for the combined model is greater than that for a single row of 45° jets. Results also show that the spanwise-averaged Nusselt number increases with decreasing jet-to-jet spacing, but is little affected by the jet-to-plate spacing, which attains the highest value at a jet-to-plate spacing of 9 d . The total average Nusselt number over the entire ribbed surface increases considerably (33%) at Reynolds numbers greater than 5000 compared with conventional configurations involving flat surfaces.


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    Title :

    Heat Transfer of Impinging Jet Arrays on a Ribbed Surface


    Contributors:
    Liu, Fangyuan (author) / Mao, Junkui (author) / Han, Xingsi (author) / Gu, Wei (author)

    Published in:

    Publication date :

    2018-01-23


    Size :

    11 pages




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English





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