Study of Needle Lift Behavior of Diesel Injector

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  • ディーゼルインジェクタにおける針弁リフト挙動の研究
  • ディーゼル インジェクタ ニオケル シンベン リフト キョドウ ノ ケンキュウ

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Using an injector with a lift sensor, the needle valve openings during injection were measured. Injection with different maximum needle valve openings was achieved by varying the injection signal to injector. A laser 2-focus velocimeter (L2F) was used for measurements of velocity and size of droplets inside diesel sprays intermittently injected into the atmosphere by using 8-hole injector nozzle. The diameter of the nozzle orifice was 0.125mm. The rail pressure was set at 40 MPa. Measurement plane was located at 7 mm downstream from the nozzle exit. The spray image was taken by the high-speed camera, and the spray width was evaluated by using spray image. The spray width at low maximum needle valve opening was wider than those at high maximum needle valve opening. Droplet velocity is lower and droplet size is smaller at low than at high maximum needle valve opening. Radial distances of measurement position were nondimensionalized by maximum spray width. The effect of the maximum needle valve opening on droplet velocity and size were small at the spray periphery.

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