Qhov cuam tshuam tshwj xeeb ntawm Upstream Thiab Downstream Ntawm Noise Reduction Effect

Qhov tshwj xeeb cuam tshuam ntawm cov dej ntws thiab cov dej hauv qab ntawm cov suab nrov txo cov nyhuv
Thaum txiav txim siab qhov cuam tshuam ntawm airflow ntawm lub suab nrov ntawm cov mufflers resistive, muaj qhov sib txawv tseem ceeb hauv cov suab nrov txo qhov cuam tshuam ntawm kev ntws mus rau pem hauv ntej thiab rov qab. Cov hauv qab no yog cov ncauj lus kom ntxaws los ntawm kev tshawb nrhiav:

 

1. Kev cuam tshuam ntawm airflow ntawm txoj cai propagation ntawm suab

Kev cuam tshuam ntawm pem hauv ntej thiab rov qab ntws ntawm lub suab attenuation coefficient: Thaum cov kev taw qhia ntawm airflow yog raws li cov kev taw qhia ntawm lub suab tsis (forward flow), lub suab attenuation coefficient txo, uas txhais tau hais tias lub attenuation ntawm lub suab tsis txo, uas yog zoo. rau kev tuav lub suab zog; Ntawm qhov tsis sib xws, thaum lub airflow kev taw qhia yog rov qab mus rau lub suab yoj kev taw qhia (rov qab ntws), lub suab nthwv dej attenuation coefficient nce, thiab lub suab nthwv dej attenuation nce, uas yog qhov zoo rau kev txo suab nrov.

 

Kev cuam tshuam ntawm Mach naj npawb: Qhov loj thiab kev taw qhia ntawm airflow tshaj tawm txiav txim tus lej Mach (qhov sib piv ntawm qhov nrawm nrawm rau lub suab nrawm), thiab ntau dua Mach tus lej qhia tias muaj kev cuam tshuam ntau dua ntawm cov cua ntws ntawm kev ua haujlwm ntawm lub muffler. Thaum ntws ntws, yog tias tus lej Mach zoo, lub suab nrov txo coefficient txo; Thaum nyob rau hauv rov qab ntws, tus lej Mach yog qhov tsis zoo thiab lub suab nrov txo coefficient nce, yog li rov qab ntws feem ntau zoo dua rau cov suab nrov txo.

 

2. Qhov tshwm sim ntawm qhov tshwm sim ntawm lub suab nthwv dej

Kev cuam tshuam ntawm pem hauv ntej thiab rov qab ntws ntawm acoustic refraction: Raws li lub hauv paus ntsiab lus ntawm acoustic refraction, suab nthwv dej yuav khoov thaum ntsib cov xov xwm sib txawv. Nyob rau hauv cov ntaub ntawv ntawm downstream ntws, suab nthwv dej yuav khoov rau ntawm cov yeeb nkab phab ntsa, thiab peripheral phab ntsa ntawm ib tug resistive muffler feem ntau muaj suab-absorbing cov ntaub ntawv, yog li suab zog yog yooj yim absorbed nyob rau hauv downstream ntws. Ntawm qhov tsis sib xws, thaum qhov ntws rov qab, lub suab tsis khoov mus rau qhov nruab nrab ntawm cov kav dej, uas tsis tsim nyog rau kev txo suab nrov.

 

3. Qhov cuam tshuam ntawm airflow regeneration suab nrov

Airflow regeneration suab nrov: Thaum lub airflow dhau los ntawm lub muffler, lub suab nrov yog tsim los ntawm kev sib cuam tshuam ntawm airflow thiab cov qauv muffler. Ob qho tib si rau pem hauv ntej thiab rov qab ntws tuaj yeem tsim cov suab nrov nrov, tab sis qhov siab dua qhov ntws tawm los yog qhov nyuaj ntawm cov qauv muffler, qhov ntau dua lub suab nrov. Rov qab ntws tuaj yeem pab txo cov suab nrov no piv rau kev ntws mus rau pem hauv ntej, vim tias txoj kev nthuav tawm ntawm lub suab tsis nyob rau hauv cov dej ntws rov qab yog qhov zoo dua rau cov khoom siv suab nrov ntawm cov muffler ua haujlwm.

Hauv cov ntsiab lus, counterflow feem ntau yog qhov zoo dua rau lub suab nrov txo cov nyhuv ntawm cov mufflers resistive, vim nws tuaj yeem ua rau kom lub suab tsis muaj zog thiab zoo dua nqus lub zog siv lub hauv paus ntsiab lus ntawm lub suab refraction. Txawm li cas los xij, hauv kev siv tswv yim, qhov airflow tshaj tawm feem ntau tsis siab dhau, yog li txawm hais tias cov nyhuv counterflow zoo dua, feem ntau, qhov cuam tshuam ntawm airflow ntawm lub suab nrov txo kev ua tau zoo kuj tseem me me thiab tuaj yeem tsis quav ntsej.