Do you understand the influence of geometric parameters of ship propellers on performance?
Large container propeller manufacturer - Marine propellers mainly consider seven parameters: diameter, number of blades, solidity, blade angle, geometric pitch, actual pitch, and theoretical pitch. Below, ZTE Marine Equipment will provide you with a detailed introduction.
Explanation of Geometric Parameters of Ship Propellers
Large container propeller manufacturers - ship propeller diameter is one of the important parameters affecting propeller performance. In general, as the diameter increases, the tensile force also increases, and the efficiency improves accordingly. So, if the structure allows, try to choose propellers with larger diameters. In addition, it is necessary to consider that the airflow velocity at the tip of the propeller should not be too high (<0.7 sound speed), otherwise shock waves may occur, leading to a decrease in efficiency.
Large container propeller manufacturers - The number of propeller blades on a ship's propeller can be considered to be directly proportional to the number of propeller blades in terms of the drag coefficient and power coefficient of the propeller.
Direct sales from large engineering ship propeller manufacturers - Ultra light aircraft generally use structurally simple double bladed propellers. Only when the diameter of the propeller is limited, the method of increasing the number of blades is used to achieve a good fit between the propeller and the engine.
Large container propeller manufacturer - the ratio of blade area to propeller rotation area (π R2) for ship propellers. Its impact is similar to that of the number of blades. As the density increases, the tension coefficient and power coefficient also increase.
Direct sales from large engineering ship propeller manufacturers - The variation of propeller blade angle with radius is the main factor affecting the good working performance of the propeller. Traditionally, the blade angle value at 70% diameter is used as the nominal value for that blade angle. Pitch: It is another way of representing the blade angle.
Direct sales from large engineering ship propeller manufacturers - the distance traveled by the propeller blade after one revolution when the geometric pitch of the ship propeller blade profile angle of attack is zero. It reflects the size of the blade angle and directly indicates the working characteristics of the propeller.
Direct sales from large engineering ship propeller manufacturers - the geometric pitch of each section of the propeller blade may not be equal. Traditionally, the geometric moment at 70% diameter is used as the naming value. Foreign countries can order propellers according to diameter and pitch. As 64/34, it indicates that the propeller diameter is 60 inches and the geometric torque is 34 inches.
Direct sales from large engineering ship propeller manufacturers - the actual pitch of the ship propeller, the distance traveled by the aircraft after one rotation of the blade. The actual torque value of the propeller can be calculated using Hg=v/n. The geometric pitch of the propeller used in the aircraft can be roughly estimated based on H=1.1-1.3Hg.
Direct sales from large engineering ship propeller manufacturers - When designing propellers based on the theoretical pitch of ship propellers, it is necessary to consider the increase in velocity of air passing through the propeller, and the airflow velocity passing through the rotating plane of the propeller is greater than the flight velocity. Therefore, the theoretical pitch of the propeller relative to the air will be greater than the actual pitch.
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