A Note on the Characteristics and Head Shape of Cobra-type Yawmeter for Fixed Direction Measurement

概要

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The cobra-type yawmeter is generally used for simultaneous measurement of by the null-reading method, but these are some special cases in which it is necessary to use it by the fixed direction method. Based on the experimental results on yaw characteristics of yawmeters of various head shapes and observation of flow on the probe-heads by tests with magnified scale models, the head shape suitable for the fixed direction magnified scale models, the head shape suitable for the fixed direction measurements is discussed in this paper. The results are summarized as follows. (1) A cobra-type yawmeter of semicircular head shape is preferable to the conventional trapezoidal head yawmeter for flow measurements by the fixed direction method. (2) A head shape modification by chamfering the front sharp edges of the trapezoidal head results in an appreciable improvement of both yaw characteristics and sensitivity of the yawmeter. (3) The semicircular head yawmeter is also superior to the trapezoidal head yawmeter in sensitivity for flow measurements by the nullreading method.
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