Engineering formula for pressure loss in an oscillating-triangular-jet nozzle

Lanspeary, P. V. and Lee, S. K. (2007). Engineering formula for pressure loss in an oscillating-triangular-jet nozzle. In: Peter Jacobs, Tim McIntyre, Matthew Cleary, David Buttsworth, David Mee, Rose Clements, Richard Morgan and Charles Lemckert, 16th Australasian Fluid Mechanics Conference (AFMC). 16th Australasian Fluid Mechanics Conference (AFMC), Gold Coast, Queensland, Australia, (443-446). 3-7 December, 2007.

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Author Lanspeary, P. V.
Lee, S. K.
Title of paper Engineering formula for pressure loss in an oscillating-triangular-jet nozzle
Conference name 16th Australasian Fluid Mechanics Conference (AFMC)
Conference location Gold Coast, Queensland, Australia
Conference dates 3-7 December, 2007
Proceedings title 16th Australasian Fluid Mechanics Conference (AFMC)
Place of Publication Brisbane, Australia
Publisher School of Engineering, The University of Queensland
Publication Year 2007
Year available 2007
Sub-type Fully published paper
ISBN 978-1-864998-94-8
Editor Peter Jacobs
Tim McIntyre
Matthew Cleary
David Buttsworth
David Mee
Rose Clements
Richard Morgan
Charles Lemckert
Start page 443
End page 446
Total pages 4
Collection year 2007
Language eng
Abstract/Summary A nozzle consisting of a circular inlet orice and a short chamber with an exit lip can produce a naturally oscillating jet ow if the expansion ratio from inlet to chamber (D/d1) is larger than ve. 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 coefcient of the inlet expansion ratio, D/d1. If an equilateral-triangular inlet replaces the circular inlet, oscillating ow occurs at equivalent expansion ratios as low as D/d1¼2, and the supply pressure is much lower. An engineering model of the loss coefcient is obtained from measurements of supply pressure over a wide range of nozzle geometries. To begin, we split the overall loss coefcient K into three components, one for each of the inlet orice, 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 tting. Combining these component formulae gives K as a function of four geometric parameters and seven numerical coefcients. When the numerical coefcients are optimised simultaneously, the r.m.s. difference between the model and the data is 2.2%.
Subjects 290501 Mechanical Engineering
Q-Index Code E1
Q-Index Status Provisional Code
Institutional Status Unknown

Document type: Conference Paper
Collection: 16th Australasian Fluid Mechanics Conference
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Created: Wed, 19 Dec 2007, 11:07:26 EST by Laura McTaggart on behalf of School of Engineering