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This paper proposes a thermo-acoustic electricity generator without resonator, which is realized by a looped-tube traveling-wave thermo-acoustic engine coupled with two linear alternators. A linear alternator is the resonating element of the thermo-acoustic engine, so its impedance determines the operating status and the clearance exerts a direct influence on it. A test bed is set to measure the clearance. An exact formula is determined after the analysis of data processing. This conclusion is used in the simulation of the influence of clearance and damping based on DeltaEC. At last, a series of experiments have been done to compare with the simulation

Investigation of the Influence of the Clearance of Linear Alternator on Thermo-acoustic Electricity Generator without Resonator