Parameter | Definition |

| The entrance diameter, which is equal to 20 mm. |

| The throat diameter |

| The outlet diameter, which is equal to 20 mm. |

| Diameter of the suction port |

| The length of the intersection of the suction pipe and the throat on the symmetry plane. |

| Convergent angle |

| Diffuser angle |

AB | The intersecting line of suction pipe and throat pipe on the symmetry plane. |

CD | A line that is perpendicular to the midpoint of line AB. |