# Beveled contraction

## Values for calculation

## Calculation

### Diameter ratio

### Coefficient $ C_B $

### Jet contraction ratio

### Loss coefficient

### Discharge coefficient

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$$β=\cfrac{d_2}{d_1}$$

$$C_B=\cfrac{l}{d_2}\cdot\cfrac{2\cdot β\cdot\tan{\left(α/2\right)}}{1-β}$$

$$λ=1+0.622\cdot\left[1+C_B\cdot\left(\left(\cfrac{α}{180}\right)^{0.8}-1\right)\right]\cdot\left(1-0.215\cdotβ^2-0.785\cdot β^5\right)$$

$$ζ=0.0696\cdot\left[1+C_B\cdot\left(\sin{\left(α/2\right)}-1\right)\right]\cdot\left(1-β^5\right)\cdot λ^2+\left(λ-1\right)^2$$

$$μ=\cfrac{1}{\sqrt{ζ+1}}$$