An experimental study on the flow field around a diffuser-circulator for office air-conditioning applications is presented. The device is designed to be attached on an industry standard ceiling unit which normally houses a diffuser consisting of multiple conical vanes. It is unique in that it functions as diffuser as well as circulator. A model of the device was attached to an aluminum frame which emulates a typical office room environment. The flow field was visualized through fog injected in and around the ducting system. The injected fog was then illuminated by a laser optical system and captured by a high-speed camera. The behavior of the ambient air induced into the circulator fan as it was driven by the air blown through the inner fan was studied, although an improvement of the outer fan design is desired that can induce a larger amount of air through the circulator.

抄録全体を表示

The inducer is an important part of rocket-engine turbopumps for which very low inlet pressure is available. In these pumping applications, it is necessary to draw the fluid into the pump with sufficient pressure rise for the impeller. The purpose of this sequel is to introduce some of the design practice which is used for the design for multiple row cascaded inducer. The sequel makes up for the previous article to design with high head and high cavitation performance.

抄録全体を表示