鉛直ダクト内の気申分散粒子輸送: 第1報-実大模型実験によるPIVを用いた流れ場の可視化計測

摘要

The transport routes of contaminants from outdoors to indoors through the ventilation system have been recognized as dominant pathways. These contaminants originating outdoors may deteriorate the indoor air quality level and adversely affect on human health. In order to prevent particulate matter contamination of indoor environments, the control of the transport of particles from outdoors to indoors through ventilators is important, and the use of a vertical ventilator is one of the effective methods to prevent the trasnport. In this paper (Part 1), visualization measurement was performed by using a PIV system to measure airflow in a vertical ventilator model. Images of smoke structures were recorded and processed to provide detailed validation data for CFD simulations. Furthermore, CFD simulation by using three types of turbulence models, Low Re type k-ε model, RNG k-e model and SST k-ω model, and by considering same geometry and boundary conditions for the experimental vertical duct model were carried out. The difference between the peak velocity values measured with the PIV system and CFD was approximatley 10 %.%外気中に含まれる真菌胞子や花粉といったバイオエアロゾルによる健康影響問題が懸rn念されており，これら気申分散粒子の効率的な除去法に関する社会的需要は大きい．本研rn究は気申分散粒子に作用する熱泳動効果，乱流泳動効果、重力沈降効果等を利用したパッrnシブ型の微粒子分離システムを開発するための基礎検討を目的とし，単純な鉛直ダクト（換rn気ダクト）内の微粒子輸送現象に着目して，美大スケール実験ならびに数値解析により基礎rnデータの蓄積を目指すものである．特に本報（第1報）では，一般的な住宅に設置する換気rnダクトを想定した美大スケールの鉛直ダクトモデルを用い，粒子画像流速測定法PIVを用rnいた可視化計測を実施した結果を報告する他，実験結果を用いてCFDによる流れ場予測精rn度の検証を行った結果を報告する．