Absorption muffler for gas-dynamic pressure-wave machines

Details Absorption muffler for gas-dynamic pressure-wave machines Absorption muffler for gas-dynamic pressure-wave machines

1984-02-22

1985-07-16

Fuller, Benjamin R.

Acoustics

Sound-modifying means

Muffler, fluid conducting type

181252, F01N 104

Patent

active

045290601

ABSTRACT:
Whereas the total noise level of an internal combustion engine supercharged by means of a gas-dynamic pressure-wave engine (1) (PWS) is usually only slightly higher than that of an engine supercharged by means of an exhaust-gas turbo supercharger (ETS), the narrow-band noise in the PWS rotational sound frequency range, the so-called PWS "whistle", is considered troublesome. The absorption muffler (3) is an elongate body, the length (l.sub.1) of which is at least 10 times the rotor outside diameter of the PWS. The inside diameter (d) of the muffler (3) corresponds to the inside diameter of the exhaust pipe (4) and is at least 0.6 times the rotor outside diameter of the PWS. The thickness (S) of the insulating material, which directly surrounds the inside diameter (d) or inner cross-section (F) of the muffler (3), is at least 6 times the rotor outside diameter of the PWS divided by the number of cells of the PWS.

REFERENCES:
patent: 2326612 (1943-08-01), Bourne
patent: 2914132 (1959-11-01), Bourne et al.
patent: 3263772 (1966-08-01), Irwin et al.
patent: 4263981 (1981-04-01), Weiss et al.

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