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At present, the prevailing technology used in sandblasting for wind turbine blades is manual sandblasting. Such technology is affected by various technological parameters, its optimal technological parameters are hard to be determined, and its sandblasting efficiency is low because blade sandblasting is a process of gas–solid coupling. A mathematical jet model and a simulation module for liquid–solid coupling were presented in this study to reveal the relationship among technological parameters, surface roughness, and sandblasting efficiency. A mathematical jet model for the blade surface sandblasting system was established on the basis of Bernoulli’s equation and Avrami formula. In such a model, the pressure at the inlet and the particle diameter were identified as key parameters that affect the particle velocity during sandblasting on blade surfaces. The relation of the characteristics between sandblasting velocity and surface roughness was confirmed, and the sandblasting efficiency was ensured to meet the sandblasting coverage rate. A simulation model for liquid–solid coupling was established using FLUENT software, and various simulation results of gas–solid biphasic flow fields and change curves of the particle velocity were analyzed. Finally, sandblasting experiments on blade surfaces were carried out. The surface micro morphology of several sets of blades was analyzed using a scanning electron microscope, and the accuracy of the model was verified. Results show that a positive relationship exists between the pressure at inlet and particle diameter and sandblasting roughness within a certain range. The pressure at the inlet and the particle diameter can affect the sandblasting efficiency. The fourth group of technological parameters is proven to be an optimal technological parameter combination of sandblasting through 12 groups of orthogonal tests. This study provides a certain reference for studying the relationship among the characteristic parameters of blade material surfaces and technological parameters for sandblasting, enhancement of blade sandblasting efficiency, and optimization decision-making for technological parameters for sandblasting.

Modules and Analysis of Technological Parameter Optimization for Surface Pretreatment with Sandblasting on Wind Turbine Blades