{"id":558133,"date":"2024-11-05T18:20:08","date_gmt":"2024-11-05T18:20:08","guid":{"rendered":"https:\/\/pdfstandards.shop\/product\/uncategorized\/esdu-780132013\/"},"modified":"2024-11-05T18:20:08","modified_gmt":"2024-11-05T18:20:08","slug":"esdu-780132013","status":"publish","type":"product","link":"https:\/\/pdfstandards.shop\/product\/publishers\/esdu\/esdu-780132013\/","title":{"rendered":"ESDU 78013:2013"},"content":{"rendered":"<p>ESDU 78013 gives a method for estimating the rearward shift of<br \/>\naerodynamic centre by treating the nacelle as an annular wing of<br \/>\ndiameter equal to the nacelle spanwise width. A graph gives the<br \/>\nlift-curve slope for an annular wing as a function of its<br \/>\nwidth\/length ratio, the lift is assumed to act at the nacelle lip,<br \/>\nand the lift contribution of the pylon is approximated by treating<br \/>\nthe two exposed stubs as a single low aspect ratio rectangular<br \/>\nwing. Factors allow for the effects of nacelle-pylon-fuselage<br \/>\ninterference and wing downwash. The method is validated by<br \/>\ncomparing predictions with wind-tunnel data taken from the<br \/>\nliterature mainly for free-flow nacelles where mass flow ratios<br \/>\nwould be appropriate to cruise. It is found to predict the shift to<br \/>\nwithin 0.02 of aerodynamic mean chord. It is emphasised that care<br \/>\nshould be taken in applying the method to configurations outside<br \/>\nthe geometry for which it was validated and that it should not be<br \/>\napplied to cases where pylon span is large compared with nacelle<br \/>\nwidth or where the nacelle entry is close to the wing<br \/>\ntrailing-edge. The wing lift-curve slope, also required in the<br \/>\nmethod, is obtained from ESDU 70011 and the aerodynamic centre of<br \/>\nthe wing-fuselage combination, to which the rearward shift is<br \/>\napplied, is obtained from ESDU 76015.<\/p>\n<p>The effect on aerodynamic centre due to wing-pylon mounted<br \/>\nnacelles is obtained from ESDU 77012.<\/p>\n<p>The computer program ESDUpac A1309, associated with ESDU 13009,<br \/>\nevaluates the chordwise position of the aerodynamic centre of<br \/>\nwing-fuselage-nacelle combinations at subsonic speeds.<\/p>\n","protected":false},"excerpt":{"rendered":"<p><b>Aerodynamic center of wing-fuselage-nacelle combinations: effect of rear-fuselage pylon-mounted nacelles<\/b><\/p>\n<table style=\"width: 100%\" border=\"0\" cellspacing=\"0\" cellpadding=\"0\">\n<tbody>\n<tr>\n<td>Published By<\/td>\n<td>Publication Date<\/td>\n<td>Number of Pages<\/td>\n<\/tr>\n<tr>\n<td><a href=\"https:\/\/pdfstandards.shop\/product-category\/publishers\/esdu\/\"><b>ESDU<\/b><\/a><\/td>\n<td>2013-11-01<\/td>\n<td>19<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n","protected":false},"featured_media":558142,"template":"","meta":{"rank_math_lock_modified_date":false,"ep_exclude_from_search":false},"product_cat":[2675],"product_tag":[],"class_list":{"0":"post-558133","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_cat-esdu","8":"first","9":"instock","10":"sold-individually","11":"shipping-taxable","12":"purchasable","13":"product-type-simple"},"_links":{"self":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product\/558133","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/types\/product"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/media\/558142"}],"wp:attachment":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/media?parent=558133"}],"wp:term":[{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_cat?post=558133"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_tag?post=558133"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}