• Effects of injection pressure and length-diameter ratio on the velocity and cavitation inside injector nozzle

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      https://www.ias.ac.in/article/fulltext/sadh/046/0056

    • Keywords

       

      Fuel injector; cavitation; nozzle hole; diesel engine; performance

    • Abstract

       

      Computational investigation was conducted to understand the effects of various parameters on nozzle flow and cavitation in a diesel fuel injector for a diesel engine. The effects of injector parameters were simulated for different conditions including the injection pressure, the outlet pressure, the position of the needlelift, and the length of the nozzle. Results show that some parameters have obvious influence on cavitation associated with nozzle flow. When the outlet pressure was constant, the velocity through the nozzle increased with the injection pressure, resulting in the cavitation at the injection pressure over 120 MPa. When the injection pressure was constant, the velocity inside nozzle decreased with the outlet pressure. As the needle tip moved closer to the bottom of minisac, the velocity inside nozzle decreased and the cavitation did not take place. The length of the nozzle hole had little effect on the velocity at inlet, but it affected the velocity distribution at outlet.

    • Author Affiliations

       

      CHANGHYUK KIM1 ZHENDONG LIU2 JEONGHOON LEE2 3

      1. School of Civil and Environmental Engineering, Pusan National University, 2 Busandaehak-ro 63beon-gil, Geumjeong-gu, Busan 46241, Republic of Korea
      2. Department of Mechanical Engineering, Graduate School, Korea University of Technology and Education,1600 Choong Jeol Ro, Byeongcheon-myeon, Dongnam-gu, Cheonan-si, Chungcheongnam-do 31253, Republic of Korea
      3. School of Mechanical Engineering, Korea University of Technology and Education, 1600 Choong Jeol Ro, Byeongcheon-myeon, Dongnam-gu, Cheonan-si, Chungcheongnam-do 31253, Republic of Korea
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