The air distributor is the end component of the ventilation system, and its performance directly determines the comfortable and pleasant feeling of the residence. A perforated plate can be added to the air distributor to convert dynamic pressure into static pressure first and then distribute the air flow, which provides better self-adjustment compared with the embedded guide vane structure. However, the perforated plate can lead to a contradiction between head loss, noise and distribution uniformity. To reconcile this problem, a novel V-shape configuration of the perforated plate was put forward in this study. The internal flow and aeroacoustic properties of different types of perforated plates were systematically studied, and a full-scale test platform was built to verify the flow characteristics. The effects of hole size and installation position of the perforated plate on the uniform distribution of air flow were analyzed by the parametric analysis method. Then, the sound pressure level of the optimized perforated plate air distributor was further analyzed. The results show that, with the optimized perforated plate structure, the uniform flow performance was improved by about 30% and the overall sound pressure level was reduced by up to 12 dB.
XuXBLanLSunYXLianZW. The effect of noise exposure on sleep quality of urban residents: a comparative study in Shanghai, China. Build Simulat2023; 16: 603–613.
2.
AhmadFFaridehAOmidTEhyaeiMA. Modeling and assessment of indoor air quality in residential units. Journal of Biological and Environmental Sciences2016; 6: 151–174.
3.
ChenXYNiuRPLvLNKuangDQ. Discussion on existing problems of fresh air system. IOP Conf Ser Earth Environ Sci2019; 237: 042032.
4.
KlymenkoHLabayVYaroslavVGensetskyiM. Criterial equation for the description of low-speed air distributor operation. In: Proceedings of international conference current Issues of Civil and environmental engineering, Lviv, Ukraine: Springer Cham Press, 2019; 235–242.
5.
VasicMStevanovicVZivkovicB. Uniformity of air flow from the ceiling diffuser by an advanced design of the equalizing element in the plenum box with side entry. Science and Technology for the Built Environment2020; 26: 1–15.
6.
FakhimBSrinarayanaNBehniaMArmfiedSW. Effect of underfloor blockages and perforated tile openings on the performance of raised-floor data centres. In: Proceedings of the 17th Australasian Fluid Mechanics Conference, Auckland, New Zealand, 5-9 December 2010, Auckland University Press, 243–246.
7.
WangGWangJJiangM. Marine cloth wind ware. Chinese Patent. CN205554550U, 2016.
8.
LiuXHanXXGaoBKXieJL. Structure optimization of outlet channel of marine air distributor. Refrig Air Cond2017; 17: 24–28.
9.
FanXLYuTLiuPLiXD. Uniformity of supply air in the plenum for under-floor air distribution ventilation in a circular conference room: a CFD study. Energies2022; 15: 6370.
10.
WangZBChiangYKChoyYSWangCQXiQ. Noise control for a dipole sound source using micro-perforated panel housing integrated with a Herschel-Quincke tube. Appl Acoust2019; 148: 202–211.
11.
ChenZXJiZLHuangHP. Acoustic impedance of perforated plates in the presence of fully developed grazing flow. J Sound Vib2020; 485: 115547.
12.
ZhangXQChengLLiuYDuJT. Acoustic modelling and analyses of geometrically complex systems with Micro-perforated panels. J Sound Vib2021; 499: 115995.
13.
FengGZLeiSYGuoYJShiDC. Optimisation of air-distributor channel structural parameters based on Taguchi orthogonal design. Case Stud Therm Eng2020; 21: 100685.
14.
GuoYJFengGZLeiSYMengBXuY. Experimental study of aerodynamic noise performance of improved air distributor for ships. Adv Mech Eng2021; 13: 168781402110012.
15.
CaoYPKeHBLinYSZengMWangQW. Investigation on the flow noise propagation mechanism in pipelines of shell-and-tube heat exchangers based on synergy principle of flow and sound fields. Appl Therm Eng2017; 122: 339–349.
16.
MendezSEldredgeJD. Acoustic modeling of perforated plates with bias flow for Large-Eddy Simulations. J Comput Phys2009; 228: 4757–4772.
17.
HabibiKMongeauL. Prediction of sound absorption by a circular orifice termination in a turbulent pipe flow using the Lattice-Boltzmann method. Appl Acoust2015; 87: 153–161.
18.
LawnC. The acoustic impedance of perforated plates under various flow conditions relating to combustion chamber liners. Appl Acoust2016; 106: 144–154.
19.
TannerPGormanJSparrowE. Flow-pressure drop characteristics of perforated plates. Int J Numer Methods Heat Fluid Flow2019; 29: 4310–4333.
20.
YuXZhangQDKangJCuiFS. Predicting integrated thermal and acoustic performance in naturally ventilated high-rise buildings using CFD and FEM simulation. Build Simulat2017; 11: 507–518.
21.
MashaeiPRAsiaeiSHosseinalipourSM. Mixing efficiency enhancement by a modified curved micromixer: a numerical study. Chem Eng Process2020; 154: 108006.
22.
WhiteFMMajdalaniJ. Viscous fluid flow. New York: McGraw-Hill, 2006.
23.
WangYPChenJLeeHCLiKM. Accurate simulations of surface pressure fluctuations and flow-induced noise near bluff body at low mach numbers. In: The seventh international colloquium on bluff body aerodynamics and applications (BBAA7), Shanghai, 2-6 September 2012, 1334–1348.
24.
DangZGMaoZYSongBWTianWL. Noise characteristics analysis of the horizontal Axis hydrokinetic turbine designed for unmanned underwater mooring platforms. J Mar Sci Eng2019; 7: 465.
25.
ZhouBYangMLiZWangZYZhangYW. Numerical simulations of forced convection across a single tube to evaluate applicability of the DNS, LES and RSM methods. Appl Therm Eng2017; 123: 123–130.
26.
GaoRLiuKKLiAGFangZYYangCQCongBH. Biomimetic duct tee for reducing the local resistance of a ventilation and air-conditioning system. Build Environ2018; 129: 130–141.
27.
ZhangYOZhangTOuyangHJLiTY. Flow-induced noise analysis for 3D trash rack based on LES/Lighthill hybrid method. Appl Acoust2014; 79: 141–152.
28.
LiuEBYanSKWangDHuangLY. Large eddy simulation and FW-H acoustic analogy of flow-induced noise in elbow pipe. J Comput Theor Nanosci2015; 12: 2866–2873.
29.
LiuYLWangKZhaoL. Study on transmission characteristics and factors influencing T-elbow aerodynamic noise in ventilation and air-conditioning pipelines. Indoor Built Environ2022; 31: 2168–2182.
30.
Ffowcs WilliamsJEHawkingsDL. Sound generation by turbulence and surfaces in arbitrary motion. Phil Trans Math Phys Eng Sci1969; 264: 321–342.
31.
BrentnerKSFarassatF. Analytical comparison of the acoustic analogy and Kirchhoff formulation for moving surfaces. Annual Forum Proceedings - American Helicopter Society1998; 36: 687–696.
32.
ZhanFLXuJW. Virtual Lab acoustics simulation calculations from entry to proficiency. Xi’an, China: Northwestern Polytechnic University Press, 2013.
33.
YangJQinGLiuW. Numerical calculation of transmission loss of muffler with airflow. Vehicle and Power Technology2015; 137: 42–46.
34.
BridgmanPW. Dimensional analysis. New Haven: Yale university press, 1922.
35.
SunBH. Dimensional analysis and lie group. Beijing: China High Education Press, 2016.
36.
BuckinghamE. On physically similar systems; illustrations of the use of dimensional equations. Phys Rev1914; 4: 345–376.
