Abstract
This paper focuses on the analysis of the gas flow in the axisymmetric mini gap bounded by the surface of the top of the labyrinth seal tooth and the surface of the body. It includes the results of experimental research and numerical calculations. Experimental research focused on the analysis of gas flow for six clearance heights in a wide range of pressure drops. Based on this research, we determined the mass flow in the clearance. Using the Saint-Venant equation, we determined the flow coefficient versus the pressure ratio upstream and downstream from the seal. Flow coefficients for various clearance heights obtained from the experiment can be divided into two data groups, the values of which differ significantly. To explain changes in the value of the gas flow coefficient for selected clearance heights, numerical analysis of the said gas flow was performed using the Fluent software. This analysis allowed us to explain the reason for the variability of the flow coefficient. This research can be the basis for determining the change of seal integrity during operation for staggered and stepped seals.
Highlights
The object of this research is the airflow through the axisymmetric mini gap for given heights of the clearance, which are a fragment of the non-contact labyrinth seal
This paper presents the seal clearance and thethe change of the gas gas flow described by the flow coefficient and the leakage amount
The value of the flow coefficient obtained from tests is included in the range from 0.6 for the small pressure drop to 0.85 for the pressure ratio close to the critical one
Summary
The object of this research is the airflow through the axisymmetric mini gap (clearance) for given heights of the clearance, which are a fragment of the non-contact labyrinth seal These types of seals are used in fluid-flow machines to minimize leakage. The modeltherein presented therein wasenthalpy based on the equation It included the presented was based on the balance included the dissipations of kinetic dissipations of kinetic energy, and the gas friction was described the modified Blasius coefficient. This paper presents the seal clearance and thethe change of the gas gas flow described by the flow coefficient and the leakage amount. This was done based on flow described by the flow coefficient and the leakage amount.
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