400 Commonwealth Drive, Warrendale, PA 15096-0001 U.S.A. Tel: (724) 776-4841 Fax: (724) 776-5760 Web: www.sae.org SAE TECHNICAL PAPER SERIES 2003-01-2128 SLD Research in the UK R. W. Gent, J. M. Ford and R. J. Moser QinetiQ Ltd D. R. Miller NASA Glenn Research Center FAA In-Flight Icing/Ground De-icing International Conference & Exhibition Chicago, Illinois June 16-20, 2003Downloaded from SAE International by University of British Columbia, Monday, July 30, 2018All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted, in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise,without the prior written permission of SAE. For permission and licensing requests contact: SAE Permissions 400 Commonwealth DriveWarrendale, PA 15096-0001-USAEmail: [email protected]: 724-772-4891Tel: 724-772-4028 For multiple print copies contact: SAE Customer ServiceTel: 877-606-7323 (inside USA and Canada)Tel: 724-776-4970 (outside USA)Fax: 724-776-1615Email: Customer [email protected] ISSN 0148-7191Copyright © 2003 QinetiQ. Reprinted by SAE Inc. with permission.Positions and opinions advanced in this paper are those of the author(s) and not necessarily those of SAE.The author is solely responsible for the content of the paper. A process is available by which discussions will be printed with the pap er if it is publishe d in SAE Transactions. Persons wishing to submit papers to be considered for presentation or publication by SAE should send themanuscript or a 300 word abstract of a proposed manuscript to: Secretary, Engineering Meetings Board, SAE. Printed in USADownloaded from SAE International by University of British Columbia, Monday, July 30, 2018ABSTRACT This paper reviews work conducted in the UK aimed at developing validated methods to simulate iceaccretion formed in super-cooled large droplet (SLD)icing conditions. To date, QinetiQ has completedone theoretical and three experimental programmesof work. Two further studies are currently in progresswithin UK universities. This paper provides resultsfrom the third test conducted by QinetiQ and NASAin the GKN Aerospace Composite TechnologiesIcing Research Wind Tunnel, Luton UK, to measurethe mass loss through droplet splash during an SLDencounter. A description of the test procedures andthe results obtained are provided. Future work onSLD methods development in progress in the UK isthen briefly outlined. 1. INTRODUCTION This paper reviews work conducted in the UK aimedat developing validated methods to simulate iceaccretion formed in super-cooled large droplet (SLD)icing conditions. In turn, this is expected to lead toimprovements in aviation flight safety when codesare used to assist in the certification of future aircraftfor flight in icing. SLD conditions are increasinglybeing defined as those in which the cloud volume median diameter (VMD) is greater than 50 µm. i.e. those that lie outside JAR 25 Appendix C. A brief review of both analytical and experimental SLD w ork conducted in the UK to date is given, followed by a description of results obtained fromtests in the ACT Luton Icing Research Wind Tunnel.The tests were aimed at quantifying the mass ofwater removed from the icing process due to splashof the impacting SLD water droplets. 2. OVERVIEW OF UK SLD RESEARCH The origin of SLD research in the UK stems from theATR crash at Roselawn, USA, in late 1994, althoughaircraft icing research has been conducted at the Royal Aircraft Establishment since the 1950sthr ough to the present day activities conducted within QinetiQ Ltd. The latter company was formedfrom the UK national aerospace research agency,DERA, which was privatised by the Government inJuly 2001. The UK Department of Trade and Industry under theCivil Aircraft Research and Technology Demonstration (CARAD) programme has sponsoredall of the SLD research at QinetiQ (DERA) to date.This has included one theoretical study [1] and threeexperiment