Enunciado

In Problem P1.24, for the given data, the air velocity at section 2 is 1180 ft/s. What is the Mach number at that section?

Passo 1

Saaaalve, tranquilo? Vamos lá resolver mais uma questão juntos?! 😊

Para calcular a velocidade do som na seção 2

a 2 = k R T 2

Aqui, temos que

Temperatura na seção 2: T 2

Razão de calor específico do ar úmido: k

Constante dos gases: R

Substituindo valores

a 2 = 1,4 ⋅ 287 ⋅ 223

→ a 2 = 299,3   m / s

Passo 2

Para calcular o número de Mach

M a = V 2 a 2

Aqui, temos que

Velocidade na seção 2: V 2

Velocidade do som na seção 2: a 2

Substituindo valores

M a = 1180   f t / s 299,3 0,305   m 1   f t

∴ M a = 1,2025

Resposta

M a = 1,2025

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