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{"id":257,"date":"2012-05-05T21:49:13","date_gmt":"2012-05-05T21:49:13","guid":{"rendered":"http:\/\/toywing.com.br\/?p=257"},"modified":"2020-05-31T03:48:57","modified_gmt":"2020-05-31T03:48:57","slug":"naca-o-que-e-e-como-funciona","status":"publish","type":"post","link":"https:\/\/toywing.com.br\/naca-o-que-e-e-como-funciona\/","title":{"rendered":"NACA – O que \u00e9 e como funciona"},"content":{"rendered":"O que \u00e9 NACA?<\/span><\/p>\nNada mais \u00e9 do que uma norma t\u00e9cnica que d\u00e1 as caracter\u00edsticas do perfil (eixo xy) do aerof\u00f3lio.<\/p>\n
No nosso caso, o perfil de NACA 0010 \u00e9 dado pelos pontos:<\/p>\n
\n\n\nUpper x<\/strong><\/td>\nUpper y<\/strong><\/td>\nLower x<\/strong><\/td>\nLower y<\/strong><\/td>\n<\/tr>\n\n0<\/strong><\/td>\n0<\/strong><\/td>\n0<\/strong><\/td>\n0<\/strong><\/td>\n<\/tr>\n\n.25<\/strong><\/td>\n.7<\/strong><\/td>\n.25<\/strong><\/td>\n-.7<\/strong><\/td>\n<\/tr>\n\n.5<\/strong><\/td>\n.95<\/strong><\/td>\n.5<\/strong><\/td>\n-.95<\/strong><\/td>\n<\/tr>\n\n1<\/strong><\/td>\n1.4<\/strong><\/td>\n1<\/strong><\/td>\n-1.4<\/strong><\/td>\n<\/tr>\n\n1.25<\/strong><\/td>\n1.60<\/strong><\/td>\n1.25<\/strong><\/td>\n-1.58<\/strong><\/td>\n<\/tr>\n\n2.5<\/strong><\/td>\n2.20<\/strong><\/td>\n2.5<\/strong><\/td>\n-2.18<\/strong><\/td>\n<\/tr>\n\n5<\/strong><\/td>\n2.98<\/strong><\/td>\n5<\/strong><\/td>\n-2.96<\/strong><\/td>\n<\/tr>\n\n7.5<\/strong><\/td>\n3.51<\/strong><\/td>\n7.5<\/strong><\/td>\n-3.5<\/strong><\/td>\n<\/tr>\n\n10<\/strong><\/td>\n3.95<\/strong><\/td>\n10<\/strong><\/td>\n-3.9<\/strong><\/td>\n<\/tr>\n\n15<\/strong><\/td>\n4.47<\/strong><\/td>\n15<\/strong><\/td>\n-4.46<\/strong><\/td>\n<\/tr>\n\n20<\/strong><\/td>\n4.78<\/strong><\/td>\n20<\/strong><\/td>\n-4.78<\/strong><\/td>\n<\/tr>\n\n25<\/strong><\/td>\n4.95<\/strong><\/td>\n25<\/strong><\/td>\n-4.95<\/strong><\/td>\n<\/tr>\n\n30<\/strong><\/td>\n5<\/strong><\/td>\n30<\/strong><\/td>\n-5<\/strong><\/td>\n<\/tr>\n\n40<\/strong><\/td>\n4.84<\/strong><\/td>\n40<\/strong><\/td>\n-4.84<\/strong><\/td>\n<\/tr>\n\n50<\/strong><\/td>\n4.41<\/strong><\/td>\n50<\/strong><\/td>\n-4.41<\/strong><\/td>\n<\/tr>\n\n60<\/strong><\/td>\n3.8<\/strong><\/td>\n60<\/strong><\/td>\n-3.8<\/strong><\/td>\n<\/tr>\n\n70<\/strong><\/td>\n3.05<\/strong><\/td>\n70<\/strong><\/td>\n-3.05<\/strong><\/td>\n<\/tr>\n\n80<\/strong><\/td>\n2.19<\/strong><\/td>\n80<\/strong><\/td>\n2.19<\/strong><\/td>\n<\/tr>\n\n90<\/strong><\/td>\n1.21<\/strong><\/td>\n90<\/strong><\/td>\n-1.21<\/strong><\/td>\n<\/tr>\n\n100<\/strong><\/td>\n.11<\/strong><\/td>\n100<\/strong><\/td>\n-.11<\/strong><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n Pelo programa Mathematica, podemos atrav\u00e9s do comando \u2018Fit\u2019 descobrir qual a fun\u00e7\u00e3o de cada curva ( a do extra e intradorso), s\u00e3o elas:<\/p>\n E = 0.0000606824276334679701 + 1.63756860254691138* x0.605326876513317202<\/sup><\/strong>\u00a0– 0.263699191260363052*x<\/p>\nI = 0.0096719243581745502 – 1.64625045045784741* x0.6100128126906650436<\/sup>\u00a0+<\/strong>\u00a00.271086647497547561*x<\/p>\nVeja como seria o perfil desse NACA:<\/p>\n <\/p>\n \u00a0A partir de agora, todos os c\u00e1lculos estar\u00e3o sujeitos a um fator de corre\u00e7\u00e3o para a escala real S=0,018 .Iniciamos agora com o c\u00e1lculo do comprimento do extra e intradorso pela formula:<\/span><\/p>\n<\/p>\n Isso, porque , como o tempo que o ar leva para pecorrer tanto o extra como o intradorso \u00e9 o mesmo, haver\u00e1 um delta de velocidade entre as faces e com isso diferen\u00e7a de press\u00e3o, ou seja, SUSTENTA\u00c7\u00c3O .<\/span><\/p>\nAssim para o extradorso temos: Comprimento extra\u00a0<\/span>= 1.82567m;<\/p>\nE para o intra: Comprimento intra = 1.82538m.<\/p>\n Analogamente, para o NACA 23012:<\/p>\n Os pontos:<\/p>\n \n\n\nUpper x<\/small><\/td>\nUpper y<\/small><\/td>\nLower x<\/small><\/td>\nLower y<\/small><\/td>\n<\/tr>\n\n0<\/td>\n | 0<\/td>\n | 0<\/td>\n | 0<\/td>\n<\/tr>\n | \n.2<\/td>\n | .65<\/td>\n | .2<\/td>\n | -.55<\/td>\n<\/tr>\n | \n.5<\/td>\n | 1.55<\/td>\n | .5<\/td>\n | -.85<\/td>\n<\/tr>\n | \n1<\/td>\n | 2.3<\/td>\n | 1<\/td>\n | -1.15<\/td>\n<\/tr>\n | \n1.25<\/td>\n | 2.67<\/td>\n | 1.25<\/td>\n | -1.23<\/td>\n<\/tr>\n | \n2.5<\/td>\n | 3.61<\/td>\n | 2.5<\/td>\n | -1.71<\/td>\n<\/tr>\n | \n5<\/td>\n | 4.91<\/td>\n | 5<\/td>\n | -2.26<\/td>\n<\/tr>\n | \n7.5<\/td>\n | 5.8<\/td>\n | 7.5<\/td>\n | -2.61<\/td>\n<\/tr>\n | \n10<\/td>\n | 6.43<\/td>\n | 10<\/td>\n | -2.92<\/td>\n<\/tr>\n | \n15<\/td>\n | 7.19<\/td>\n | 15<\/td>\n | -3.5<\/td>\n<\/tr>\n | \n20<\/td>\n | 7.5<\/td>\n | 20<\/td>\n | -3.97<\/td>\n<\/tr>\n | \n25<\/td>\n | 7.6<\/td>\n | 25<\/td>\n | -4.28<\/td>\n<\/tr>\n | \n30<\/td>\n | 7.55<\/td>\n | 30<\/td>\n | -4.46<\/td>\n<\/tr>\n | \n40<\/td>\n | 7.14<\/td>\n | 40<\/td>\n | -4.48<\/td>\n<\/tr>\n | \n50<\/td>\n | 6.41<\/td>\n | 50<\/td>\n | -4.17<\/td>\n<\/tr>\n | \n60<\/td>\n | 5.47<\/td>\n | 60<\/td>\n | -3.67<\/td>\n<\/tr>\n | \n70<\/td>\n | 4.36<\/td>\n | 70<\/td>\n | -3<\/td>\n<\/tr>\n | \n80<\/td>\n | 3.08<\/td>\n | 80<\/td>\n | -2.16<\/td>\n<\/tr>\n | \n90<\/td>\n | 1.68<\/td>\n | 90<\/td>\n | -1.23<\/td>\n<\/tr>\n | \n95<\/td>\n | .92<\/td>\n | 95<\/td>\n | -.70<\/td>\n<\/tr>\n | \n100<\/td>\n | .13<\/td>\n | 100<\/td>\n | -.13<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n As equa\u00e7\u00f5es:<\/span><\/p>\nE = 0.000568442138250302431 + 2.66218306475660515* x0.581223009456498385<\/sup><\/strong>\u00a0\u2013 0.386397298071799255*x<\/p>\nI = 0.000926293765223591742 \u2013 1.33146805501421972* x0.712514606549434237<\/sup><\/strong>\u00a0+ 0.354463051698646758*x<\/p>\n\u00a0Assim o perfil ser\u00e1:<\/p>\n \u00a0<\/span><\/p>\nComprimento do extra e intra dorso:<\/span><\/p>\nComprimento extra = 1.85559 m;<\/p>\n Comprimento intra = 1.81777 m.<\/p>\n Calculando a velocidade m\u00ednima (Stol):<\/p>\n Como nessa situa\u00e7\u00e3o o peso deve ser igual a for\u00e7a de sustenta\u00e7\u00e3o, temos:<\/span><\/p>\n<\/p>\n <\/p>\n Supondo que a massa(m) do avi\u00e3o seja m =2000 kg , o g local = 9.8 m\/s\u00b2 e K = 4.42 . E considerando o coeficiente de sustenta\u00e7\u00e3o m\u00e9dio entre as duas NACAs que dispon\u00edveis teremos a velocidade m\u00ednima de v\u00f4o ( velocidade de Stol) :<\/span><\/p>\nVStol<\/sub>\u00a0= 100.519 km\/h (54.276 n\u00f3s)<\/span><\/p>\nCom esse dados obtidos, suadamente, e continuando suando, vamos calcular a Sustenta\u00e7\u00e3o pela diferen\u00e7a da press\u00e3o din\u00e2mica entre as faces superior e inferior do aerof\u00f3lio.<\/span><\/p>\nComo j\u00e1 foi discutido:<\/span><\/p>\n<\/span><\/p>\nent\u00e3o a velocidade ve<\/sub>\u00a0para asa \u00e9:<\/p>\nve<\/sub>\u00a0= 101.5702 km\/h (54.844 n\u00f3s);<\/strong><\/p>\nPress\u00e3o din\u00e2mica:<\/p>\n <\/span><\/p>\n[q<\/em>] = Pa = N\/m\u00b2;<\/p>\nw = 9.94<\/p>\n A Sustenta\u00e7\u00e3o \u00e9 dada por:<\/p>\n L = Cl A ( | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |