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|Title:||Engineering formula for pressure loss in an oscillating-triangular-jet nozzle|
|Citation:||Proceedings of the 16th Australasian Fluid Mechanics Conference / P. Jacobs, T. McIntyre, M. Cleary, D. Buttsworth, D. Mee, R. Clements, R. Morgan, C. Lemckert (eds.), 3-7 December 2007: pp.443-446.|
|Publisher:||University of Queensland|
|Conference Name:||Australasian Fluid Mechanics Conference (16th : 2007 : Gold Coast, Australia)|
|P. V. Lanspeary and S. K. Lee|
|Abstract:||A nozzle consisting of a circular inlet orifice and a short chamber with an exit lip can produce a naturally oscillating jet flow if the expansion ratio from inlet to chamber (D/d1) is larger than five. As an industrial natural-gas burner, the device offers advantages over simple nozzles of equivalent capacity. However, its usefulness as a pulverised solid-fuel burner is constrained because it requires a high supply pressure. This is due to the high energy-loss coefficient of the inlet expansion ratio, D/d1. If an equilateral-triangular inlet replaces the circular inlet, oscillating flow occurs at equivalent expansion ratios as low as D/d1¼2, and the supply pressure is much lower. An engineering model of the loss coefficient is obtained from measurements of supply pressure over a wide range of nozzle geometries. To begin, we split the overall loss coefficient K into three components, one for each of the inlet oriffice, chamber and exit lip. A formula representing each component of K is then determined from dimensional analysis, inspection of the data, and least-squares curve fitting. Combining these component formulae gives K as a function of four geometric parameters and seven numerical coefficients. When the numerical coefficients are optimised simultaneously, the r.m.s. difference between the model and the data is 2.2%.|
|Rights:||Copyright status unknown|
|Appears in Collections:||Aurora harvest|
Mechanical Engineering conference papers
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