Africa-Press – Senegal. <\/strong><\/span>Le Chine vient de tester avec succe\u0300s le statore\u0301acteur a\u0300 de\u0301tonation rotative de son futur jet supersonique Yunxing. L\u2019engin est parvenu a\u0300 e\u0301voluer a\u0300 une vitesse de Mach 4.<\/p>\nVoler deux fois plus vite que le Concorde et deux fois plus haut que n’importe quel avion de ligne, c’est l’ambition de la socie\u0301te\u0301 chinoise Lingkong Tianxing Technology. La firme compte faire voler un jet supersonique suppose\u0301ment commercial, baptise\u0301 Yunxing, dote\u0301 de ce type de capacite\u0301 de\u0300s 2027. Il se pourrait bien qu’elle y parvienne et tienne ce de\u0301lai optimiste, puisqu’elle vient de tester avec succe\u0300s le moteur de l’ae\u0301ronef capable de ces performances. Ce moteur repose sur la technologie a\u0300 statore\u0301acteur et porte le nom de JinDou400. Pour son essai, il a e\u0301te\u0301 monte\u0301 au sommet d’une fuse\u0301e avant d’e\u0302tre largue\u0301 a\u0300 6 100 me\u0300tres d’altitude. Il s’est hisse\u0301 ensuite a\u0300 pre\u0300s de 20 000 me\u0300tres a\u0300 une vitesse de Mach 4, soit autour de 5 000 km\/h.<\/p>\n
Contrairement a\u0300 un turbore\u0301acteur, le statore\u0301acteur est de\u0301nue\u0301 de pie\u0300ces mobiles. L’engin est plus compact, plus le\u0301ger et plus e\u0301conomique a\u0300 produire. En revanche, il ne peut de\u0301marrer qu’a\u0300 partir d’une vitesse supersonique. Le principe repose sur la de\u0301tonation rotative. Contrairement a\u0300 ce que l’on peut imaginer, rien ne tourne, sauf la de\u0301tonation. Le carburant et le comburant sont introduits simultane\u0301ment et en continu dans l’espace entre deux cylindres coaxiaux. La combustion provoque une onde de de\u0301tonation supersonique qui tourne autour de l’axe. En conse\u0301quence, la pression qui s’e\u0301chappe cre\u0301e une e\u0301norme pousse\u0301e.<\/p>\n
Un air de de\u0301ja\u0300-vu !<\/b><\/p>\n
Pour amener le moteur a\u0300 la vitesse supersonique, un turbore\u0301acteur est ne\u0301cessaire pour ge\u0301rer l’e\u0301tape du vol subsonique. C’est bien pour cette raison que le moteur a e\u0301te\u0301 pousse\u0301 a\u0300 cette vitesse gra\u0302ce a\u0300 une fuse\u0301e lors du test. Co\u0302te\u0301 caracte\u0301ristiques, le JinDou400 mesurerait environ trois me\u0300tres de long pour 30 centime\u0300tres de diame\u0300tre. Sa pousse\u0301e serait 400 kgf (kilogramme-force). Par la suite, le moteur devrait donc e\u0302tre embarque\u0301 dans un jet supersonique, appele\u0301 Yunxing.<\/p>\n
Lorsque l’on observe ses premiers rendus graphiques, le profil de l’ae\u0301ronef fait imme\u0301diatement penser au SR-71 Blackbird. Cet avion de l’arme\u0301e ame\u0301ricaine, a\u0300 la retraite depuis 26 ans, pouvait voler autour de Mach 3,3 a\u0300 une altitude de pre\u0300s de 26 000 me\u0300tres. Il e\u0301tait propulse\u0301 par un couple turbore\u0301acteur\/statore\u0301acteur. Comme le dit la maxime, \u00ab qui n’imite point, n’invente point \u00bb, mais pour se diffe\u0301rencier de sa source d’inspiration, le Yunxing promet d’e\u0302tre nettement plus rapide que le SR-71. Il pourrait aussi e\u0302tre capable de de\u0301coller et d’atterrir verticalement.<\/p>\n
Pour plus d’informations et d’analyses sur la Senegal<\/span>, suivez Africa-Press<\/span><\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"par Sylvain Biget Africa-Press – Senegal. Le Chine vient de tester avec succe\u0300s le statore\u0301acteur a\u0300 de\u0301tonation rotative de son futur jet supersonique Yunxing. L\u2019engin est parvenu a\u0300 e\u0301voluer a\u0300 une vitesse de Mach 4. Voler deux fois plus vite que le Concorde et deux fois plus haut que n’importe quel avion de ligne, c’est […]<\/p>\n","protected":false},"author":82,"featured_media":64154,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[22,10],"tags":[44],"class_list":["post-64156","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-divers","category-toutes-les-actualites","tag-senegal-2"],"yoast_head":"\n
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