He aha te pānga o te ōwehenga L/D ki te mahi a te tīwiri i roto i te tangohanga kirihou?
Kupu Whakataki
I roto i te tukatuka whakaputa kirihou, ka pāngia tika te pumau o te rewa me te ōritetanga o te putanga e te whirihoranga o te tīwiri. I roto i ngā tawhā hanganga katoa, ko te ōwehenga L/D tētahi o ngā mea hoahoa tino nui.
Mā te mārama ki te pānga o te ōwehenga roa-ki-te-diameter ki te whanonga rewa me te whai huatanga o te whakaputa ka āwhina i ngā kaihanga ki te whiriwhiri i ngā otinga oko tīwiri e tika ana.
1. He aha te ōwehenga L/D?
Ko te ōwehenga L/D e pā ana ki te ōwehenga i waenga i te roa o te tīwiri (L) me te whānui o te tīwiri (D). Hei tauira, ko te tīwiri 120mm me te roa 3000mm he ōwehenga L/D 25:1.
2. Te Pānga ki te Whai Hua o te Rewa
Mā te teitei ake o ngā ōwehenga L/D ka roa ake te noho o te rauemi, ka taea ai te rewa katoa me te whakakotahitanga pai ake.
Heoi, mā te roa rawa ka hua ake ēnei āhuatanga:
- Te nui ake o te whakapaunga pūngao
- Te wera kutikuti kua piki ake
- Te pirau pea o ngā rauemi
3. Pānga ki te Pūmautanga o te Putanga
| Awhe L/D | Ngā Painga | Ngā Mōrearea Pea |
|---|---|---|
| 20:1 – 24:1 | Te iti o te whakapaunga pūngao | Te rewa kore oti |
| 24:1 – 30:1 | Te rewa taurite me te putanga | Te pikinga pūngao taurite |
| Neke atu i te 32:1 | Teitei o te whakakotahitanga | Te mōrearea o te wera rawa |
4. Ngā Whakaaro Whakamahinga Whaihua
Mō te whakaputanga o ngā paipa HDPE, ko te ōwehenga 28:1 te mea e whakamahia whānuitia ana. Mō ngā rauemi hangarua, mā te iti ake o ngā ōwehenga L/D ka whakaiti i te ahotea wera.
Whakamutunga
Ko te whiriwhiri i te ōwehenga L/D e tika ana me whakataurite i te pai o te rewa, te tono putanga, me te utu pūngao. Mā te huarahi whakarite ka pumau te mahi mō te wā roa.