In one embodiment of the invention, the noise of a supersonic jet of gas venting from a lower stack having a flow control means may be reduced by at least about 20 dBA by attaching an upper stack to the lower stack, said upper stack being packed with granulae to provide a bed height at least one dia
In one embodiment of the invention, the noise of a supersonic jet of gas venting from a lower stack having a flow control means may be reduced by at least about 20 dBA by attaching an upper stack to the lower stack, said upper stack being packed with granulae to provide a bed height at least one diameter of the upper stack the cross section area of the interstitial voids between the granulae being at least about 2.25 times larger than the cross section area of the flow controlling means installed in the lower stack. The said bed is contained in the upper stack and kept in place by suitable upper and lower retainers such as, for example, a mesh or a perforated plate.
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1. A noise suppressor for gas jets comprising in cooperating arrangement: i) a lower vent stack having installed at its upper end a flow controlling means having a total open cross sectional area less than the cross sectional area of said lower vent stack;ii) above and co-operating with said lower v
1. A noise suppressor for gas jets comprising in cooperating arrangement: i) a lower vent stack having installed at its upper end a flow controlling means having a total open cross sectional area less than the cross sectional area of said lower vent stack;ii) above and co-operating with said lower vent stack an upper vent stack having a cross section area larger, relative to the open cross sectional area of said flow controlling means and sufficient to cause supersonic flow at the upper stack exit absent component iii) below, and a ratio of length to diameter of at least about 5:1;iii) within the upper vent stack, a bed of inert, rigid (solid or hollow) tightly packed granulae, said bed having the height at least equivalent to one diameter of said upper stack, and having a total cross sectional area of interstitial voids among the granulae not less than about 2.25 times the cross sectional area of the total open area of said flow controlling means. 2. The noise suppressor according to claim 1, wherein near the inlet for said upper vent stack there is a perforated base for said bed of inert, rigid (solid or hollow), tightly packed granulae, selected from a wire mesh, a perforated plate and a grid of parallel metal bars defining openings there through having a maximum size not more than about 70% of the characteristic dimension of the inert granular packing. 3. The noise suppressor according to claim 2 further comprising at the top of the bed a perforated cap selected from a wire mesh, a perforated plate and a grid of parallel metal bars defining openings there through having a maximum size not more than about 70% of the characteristic dimension of the inert granular packing. 4. The noise suppressor according to claim 3, wherein the inert granular packing comprises the particles of the same size and the same regular shape selected from solid spheres, rods, pellets, prills saddles, and rings, made of the material selected from metal, ceramic and polymeric materials, having a melting temperature not less than about 50° C. greater than the temperature of the gas to be passed through the noise suppressor. 5. The noise suppressor according to claim 3, wherein the inert granular packing comprises mixture of irregularly shaped or differently shaped particles, with size distribution within about ±25% of the average mean dimension. 6. The noise suppressor according to claim 3, wherein the inert granular packing is cleaned and sieved gravel having a size distribution within about ±25% of average sieve size. 7. The noise suppressor according to claim 4, wherein the upper vent stack has a diameter substantially the same as the lower vent stack and has a length to diameter ratio of not less than about 10:1. 8. The noise suppressor according to claim 4, wherein the upper vent stack has a diameter from about 2 to about 10 times the diameter of the lower vent stack and has a length to diameter ratio of not less than about 5:1. 9. The noise suppressor according to claim 7, wherein the granular packing is selected from granulae of ceramic or metal spheres, and sieved gravel. 10. The noise suppressor according to claim 8, wherein the granular packing is selected from granulae of ceramic or metal spheres, and sieved gravel. 11. The noise suppressor according to claim 9, wherein the flow control means is selected from a valve and an orifice plate. 12. The noise suppressor according to claim 10, wherein the flow control means is selected from a valve and an orifice plate. 13. The noise suppressor according to claim 11, wherein the flow control means is an orifice plate. 14. The noise suppressor according to claim 12 wherein the flow control means is an orifice plate. 15. A noise suppressor for gas jets comprising in cooperating arrangement: i) a lower vent stack having installed at its upper end an orifice plate having a total open cross sectional area less than the cross sectional area of said lower vent stack;ii) above and co-operating with said lower vent stack an upper vent stack having a cross section area larger, relative to the open cross sectional area of said orifice plate and sufficient to cause supersonic flow at the upper stack exit absent component iii) below, and a ratio of length to diameter of at least about 5:1;iii) within the upper vent stack, a bed of inert, rigid (solid or hollow) tightly packed granulae, said bed having the height at least equivalent to one diameter of said upper stack, and having a total cross sectional area of interstitial voids among the granulae not less than about 2.25 times the cross sectional area of the total open area of said orifice plate;iv) at the top of the bed a perforated cap selected from a wire mesh, a perforated plate and a grid of parallel metal bars defining openings there through having a maximum size not more than about 70% of the characteristic dimension of the inert granular packingwherein near the inlet for said upper vent stack there is a perforated base for said bed of inert, rigid (solid or hollow), tightly packed granulae, selected from a wire mesh, a perforated plate and a grid of parallel metal bars defining openings there through having a maximum size not more than about 70% of the characteristic dimension of the inert granular packing. 16. A method to reduce the noise from a supersonic jet by at least about 20 dBA, while preserving the vented gas flow rate, by passing the gas flow through a noise suppressor for gas jets comprising in cooperating arrangement: i) a lower vent stack having installed at its upper end a flow controlling means having a total open cross sectional area less than the cross sectional area of said lower vent stack;ii) above and co-operating with said lower vent stack an upper vent stack having a cross section area larger, relative to the open cross sectional area of said flow controlling means and sufficient to cause supersonic flow at the upper stack exit absent component iii) below, and a ratio of length to diameter of at least about 5:1;iv) within the upper vent stack, a bed of inert, rigid (solid or hollow) tightly packed granulae, said bed having the height at least equivalent to one diameter of said upper stack, and having a total cross sectional area of interstitial voids among the granulae not less than about 2.25 times the cross sectional area of the total open area of said flow controlling means. 17. The method of claim 16, wherein near the inlet for said upper vent stack there is a perforated base for said bed of inert, rigid (solid or hollow), tightly packed granulae, selected from a wire mesh, a perforated plate and a grid of parallel metal bars defining openings there through having a maximum size not more than about 70% of the characteristic dimension of the inert granular packing. 18. The method of claim 16, wherein the noise suppressor further comprises at the top of the bed a perforated cap selected from a wire mesh, a perforated plate and a grid of parallel metal bars defining openings there through having a maximum size not more than about 70% of the characteristic dimension of the inert granular packing. 19. The method of claim 16, wherein the flow control means is selected from a valve and an orifice plate. 20. The method of claim 16, wherein the noise from a supersonic jet is reduced by at least about 30 dBA.
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