在不良天候下之飛機性能參數化研究

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Title:	在不良天候下之飛機性能參數化研究
Other Titles:	A Study of Aircraft Performance Parameter under Adverse Weather Conditions
Authors:	宛同;王正民
Contributors:	淡江大學航空太空工程學系
Keywords:	F 參數;低空風切;亂流;大雨;積冰;飛機性能;飛行安全
Date:	2006-03
Issue Date:	2013-07-24 11:47:02 (UTC+8)
Publisher:	臺北縣淡水鎮：淡江大學
Abstract:	為人所週知的，某些天氣現象會對飛行安全造成相當大的危害，例如低空風切、亂流、大雨和積冰等現象。本研究的目的是欲藉由低空風切危害參數F參數為媒介，對在不良天候下飛行的飛機，其性能將會出現何種程度的衰減進行暸解。本文將先建立三維的低空風切風場及三維的F參數，將其所計算出來的結果與代表亂流的T參數相加。其次將大雨和積冰情形下使用空氣動力學方程式所解算出的飛機性能衰減量，將其換算成等效的F 參數，並將其與前者相加，從而得知在此種天候下飛機性能的總衰減量。在三維F參數的建立上，考慮到側風對飛機的影響，採用二維的F參數加上角動量的影響做為三維F 參數;在亂流的部分則使用自行創造的T參數，其原理為將飛機在風場中受到的三維加速度和角加速度變化參數化。在大雨和積冰的部分，則採用前人所建立的計算流體力學方法解析飛機的空氣動力係數，將其衰減的飛機性能計算出來，並換算出其相對應的F參數值。最後將飛機遭遇的惡劣天氣現象之等效F 參數和T參數相加成為新發展的FW 參數，求得同時面對多種惡劣天氣現象下，飛機受到的影響總合，並探討多種惡劣天氣存在時，單獨天氣現象對飛機所造成影響之比重。 It is well known that some meteorological phenomenon will cause sizable danger to aviation safety, for example: low level windshear, turbulence, ice accretion and heavy rain, etc. The purpose of this research is to find out, by using existing low level windshear F-factor as the medium, the degrees of performance degradation for aircraft flying under different adverse weather conditions. First of all, the study will set up the low level windshear 3-D wind field (including the side wind) and 3-D F-factor, then tally up the result with turbulence T-factor developed by our research group earlier. Secondly, take the aircraft performance amount calculated from heavy rain and ice accretion by using existing CFD techniques; convert it to an equivalent F -factor value. Add it with the previous result would get us the total performance amount under these weather conditions. At the end, tally up the different F-factor and T-factor values from the four adverse weather conditions that the aircraft might face, forming FW-factor, which will lead to the total aircraft performance degraded values in various adverse weather conditions. It is believed that the FW-factor represents a measuring weighting parameter for each adverse weather condition, which might co-exist with each other.
Relation:	第五屆海峽兩岸航空太空學術研討會論文集，頁417-426
Appears in Collections:	[Graduate Institute & Department of Aerospace Engineering] Proceeding

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