Podziałka:

$$t = \frac{\pi*D_{z}}{z} = \frac{3,14*0,33}{15} = 0,07\ $$

$$A = A_{0} = \frac{\pi*(D_{2}^{2} - D_{1}^{2})}{4} = \frac{3,14*({0,4}^{2} - {0,27}^{2})}{4} = 0,068m^{2}$$

A₁ = A₀ − h * σ₁ * z = 0, 068 − 0, 06 * 0, 012 * 15 = 0, 057m²

A₂ = A₀ − h * σ₂ * z = 0, 068 − 0, 06 * 0, 002 * 15 = 0, 066m²

A₁ < A₂

Obliczanie prędkości obrotowej

$$u_{12} = \frac{\pi*D_{12\left( sred \right)}*n}{60}$$

Obliczanie prędkości c₁=c_1Z

$$\frac{c_{1z}}{u} = tan\beta_{1} = 25,3*tan30 = 14,6m/s$$

Obliczanie wydajności V₁

V₁ = A₁ * c_1Z = 0, 057 * 14, 6 = 0, 83m³/s

Obliczanie składowej c_2z

$$c_{2z} = \frac{V_{1}}{A_{2}} = \frac{0,83}{0,066} = 12,6m/s$$

Obliczenie prędkości względnej w₁ w₂

$$\frac{c_{1z}}{w_{1}} = sin\beta_{1}$$

$$w_{1} = \frac{c_{1Z}}{\sin\beta_{1}} = \frac{14,6}{sin30} = 29,2m/s$$

$$\frac{c_{2z}}{w_{2}} = sin\beta_{2}$$

$$w_{2} = \frac{c_{2z}}{\sin\beta_{2}} = \frac{12,6}{sin60} = 14,5m/s$$

Obliczanie składowej c_2u

$$\frac{c_{2Z}}{u - c_{2u}} = tan\beta_{2}$$

c_2Z = tanβ₂ * (u−c_2u) = u * tanβ₂ − c_2u * tanβ₂

$$c_{2u} = u - \frac{c_{2z}}{\beta_{2}} = 25,3 - \frac{12,6}{tan60} = 18m/s$$

Obliczanie teoretycznego ciśnienia Δput:

put = ρ * u(c_2u−c_1u) = ρ_u * u * c_u = 1, 2 * 25, 3 * 18 = 546, 5Pa

$V_{t} = \frac{0,83m^{2}}{s}$

put∞=546Pa

V_rz = 1.13

pcrz = 286Pa

put∞→pu

pu = put∞*μ * ξ_p = 330Pa