Abstract: Researchers kept on studying small-gap magnetic fluid over years. In order to meet the demand for large-gap static seal in the fields of aviation, aerospace, metallurgy, and so on. A test rig of magnetic fluid static seal is set up and specimens of magnetic fluid static seal are designed. With the test rig, in-depth study on magnetic fluid static seal is carried out. Through tests, the relationships among the failure pressure, the amount of injection of magnetic fluid, seal gap, seal temperature and magnetization intensity are deduced. Theoretically, the distribution of magnetic field in the specimen seal gap is calculated, the analytical expression of the relationship between static seal failure pressure and temperature is deduced, the maximum failure pressures in different gaps and different saturation magnetizations are calculated. The test and theoretical calculation results are analyzed in detail. The theoretical analysis and tests indicate that large-gap magnetic fluid static seal can withstand a certain pressure and has practical value.

Key words: Large gap, Magnetic fluid, Magnetization, Seal