Method for modifying performance of rotor profile by adjusting meshing line segments

A method for modifying performance of a rotor profile by adjusting meshing line segments, comprising:

• step 1, dividing a meshing line of a bilateral profile into eight functional segments;
• step 2, constructing each of the eight functional segments by using a cubic Non-Uniform Rational B-Spline (NURBS) curve;
• and
• step 3, locally adjusting the functional segments of the meshing line by adjusting control points or weight factors of the NURBS curve, and observing corresponding changes of the rotor profile so as to adjust corresponding geometrical parameters;
• wherein the eight functional segments comprises af, fo0, o0b, bc, cd, do0, o0e and ea, where point a is a rightmost intersection of the meshing line and x0 axis, which is, a tangent point of a tip circle of a female rotor and a root circle of a male rotor, point b is a lowest point of the meshing line in a III quadrant, point c is a point farthest from coordinate origin O0 in a horizontal direction on the meshing line, which is, a tangential point of a tip circle of a male rotor and a root circle of the female rotor, point d is a highest point of the meshing line in a II quadrant, point e is a lowest point of the meshing line in a IV quadrant, and point f is a highest point of the meshing line in a I quadrant.