Air Injection Transparent Png Cavitation

In order to continuously inject air bubbles into the water stream a solid rod with a 1 mm deep groove is.

Air injection transparent png cavitation. Abstract it has been pointed out that cavitation occurs in a nozzle of a fuel injector for a diesel engine and affects the injected spray. The corresponding injection pressure varied from 1 105 pa to 12 10 5 pa which is sufficiently high to introduce strong cavitation in large nozzle. For the observation of internal flow and cavitation in the transparent nozzle. Pressurized air injection in an axial hydro turbine model for the mitigation of tip leakage cavitation a rivetti 1 m angulo c lucino1 and s liscia unlp laboratory of hydromechanics 47 street.

In the nozzle a so called string cavitation which. The air injection rate is controlled by using a programmable variable speed syringe pump new era pump system inc just infusion pump ne 300. To answer these unknown questions a visual injection system with a 5 time scaled up transparent nozzle is built and high speed imaging technique is first used to study the characteristics of cavitation under various injection pressures and needle lifts in the present study. The needle lift is controlled to achieve various throttling strengths.

Cavitation and aerated cavitation experiments has been carried out on a symmetrical. As a result. The syringe pump is connected to the top of the test section with a flexible transparent tube i d. 320 128 pixels frame.

At the injection pressure of 100 mpa the reynolds number of the in nozzle flow was on the order of 10 4 and the flow was in the lamellar to turbulent transition region if confined in a pipe. The transparent symmetrical venturi nozzle is placed in the test section see. The string cavitation inside the 10 times enlarged transparent nozzles with mini sac at different needle lift under the different injection pressure was shown in fig 3 s when the injection pressure is 0 3mpa and the needle lift is low fig 3 a the string cavitation originates from needle tip surface and appears very thick and have a larger influence on spray angle. Two types of high speed camera were used for visualization.

By the air injection ring. When investigating the dynamics of cavitation vapor bubbles in the transparent nozzle the ambient condition is atmospheric. One was photron fastcam sa1 1 resolution. A shadowgraph technique was introduced to observe cavitation in the nozzle and the spray formation process during fuel injection.