Overview on the profile measurement of turbine blade and its development

Abstract

Turbine machinery has an extraordinary wide range of applications in the aviation, aerospace, automotive, energy and many other industries. The turbine blade is one of the most important parts of turbine machinery, and the characteristic parameters, pressure ratio of the engine and rotating speed of the turbine are all related to the shape and size of blades. Therefore, the profile measurement of turbine blade is an essential issue in the blade machining processing, however, it is difficult and particular to establish the profile measurement of turbine blade because of its complicated shapes and space angles of the blades, and the specific stringent environmental requirements need a more appropriate measurement method to the Turbine Blade profile measurement. This paper reviews the recent research and development on the Turbine Blade profile measurement methods, which mainly describes several common and advanced measurement methods, such as the traditional coordinate measuring machines, some optical measurement methods with the characteristics of non-contact like optical theodolite, three-dimensional photography, laser interferometry, as well as the laser triangulation method studied more recently and so on. Firstly, the measuring principles, the key technical issues and the applications in the Turbine Blade profile measurement of the methods which are mentioned above are described respectively in detail, and the characteristics of those methods are analyzed in this paper. Furthermore, the scope of application and limitations of those measurement methods are summed up. Finally, some views on the current research focus and perspective trend of the Turbine Blade profile measurement technology are presented.

Research on Multi-view 3D Measurement Technology of Blade Based on Linear Structured Light

“…This measurement method has the advantages of high accuracy and reliability, but also has the disadvantages of long measurement time, low efficiency, and easy to damage the probe and the object to be measured, etc. The Non-contact Measurement acquires the three-dimensional morphology of the surface of the object to be measured through the acoustic, optical, and electromagnetic methods, which are mainly ultrasonic ranging, Structured light method, industrial CT and other methods, non-contact measurement methods both high-speed and high-efficiency advantages, in recent years has been widely used in a variety of industrial inspection environment [5][6] [7] . The complexity of the blade profile requires high measurement accuracy and integrity, and there is no universal measurement method with both high accuracy and high integrity.…”

High Efficiency Coordinate System Alignment Method for Turbine Blade Measuring System

“…It is very important to inspect the quality of the blades in the manufacturing process and after completion, and then analyse whether the machining accuracy meets the requirements [1][2][3]. Different from other complex surfaces, blades have their own unique evaluation parameters, mainly including profile feature parameters, such as stacking point, blade chord, chord angle, blade thickness, maximum thickness of blade, leading edge point, trailing edge point, leading and trailing edge radius, central arc, and position parameters, such as blade twist angle, inclination, blade profile waviness, etc [4][5]. The main characteristics of blade measurement compared with other parts measurement are: (1) the blade surface profile is complex, with high twist, and the curvature of the leading and trailing edges changes greatly; (2) The measurement accuracy requirements of the leading and trailing edges of the blade are inconsistent with those of the blade concave and convex surface.…”

Shape Evaluation Method for Leading and Trailing Edges of Aero-engine Blade

“…Blade is not only one of the important parts of aero-engine, but also a key active component related to the safety performance of the engine. Thus, the detection of blade profile is of great significance in the detection of aero-engine parts [1] .…”