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style="margin-top: 20px;" class="wlcontent"> <div style="width:100%;text-align:center;margin:20px auto;"> <img src="upfile/2018/07/20180705091504_842.jpg" style="max-width:100%;" alt="車用尿素水,車用尿素溶液" /> </div> <p class="MsoNormal" style="margin: 7.5pt 0pt; text-indent: 0pt; padding: 0pt; line-height: 18.75pt; background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial;"><span style="font-family: Tahoma; color: #333333; letter-spacing: 0pt; font-size: 10.5pt; background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial;"><span style="font-family: Tahoma;">催化器與排氣管連接為漸擴漸縮過渡，排氣易在連接處發生壁面分離，從而在擴張段形成渦流現象。而由于渦流的產生使催化劑前端的氣體流速呈放射狀分布，中間區域速度大于周圍區域，氣流對催化劑中間區域沖擊大于周圍，容易造成催化劑的應力變形和冷啟動時的熱應力變形，從而縮短催化劑壽命。并且渦流會影響尿素液滴的軌跡和還原劑的分布。</span></span><span style="font-family: Tahoma; color: #333333; letter-spacing: 0pt; font-size: 10.5pt; background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial;"><br /></span><span style="font-family: Tahoma; color: #333333; letter-spacing: 0pt; font-size: 10.5pt; background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial;"> 而且在催化器入口下側渦流區，由于尿素溶液的蒸發和熱解反應，溫度降低較大，催化劑入口溫度分布不均會導致SCR化學反應不均和催化劑的熱穩定性變差，降低NOx轉化效率與催化劑的耐久性。系統壓降主要集中在催化劑役和催化器出口，整個流動區域的壓力損失約為2.80kPa。</span><span style="font-family: Tahoma; color: #333333; letter-spacing: 0pt; font-size: 10.5pt; 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