Hi, a simple yes or no question.
I use the same turbine account for lotro and ddo, when I will delete ddo account, will it affect my lotro account anyway?
Why delete it? If you want to stop playing you can uninstall it. Everything you have bought on the account can be used by you til the servers shut down for good.
As you can not delete your account other by being permabanned, no, it will not effect your lotro account.
Will getting permabanned in ddo effect your lotro account? I have no clue.
Deleting your client will have no effect on your account.
Also note that Turbine does not delete accounts that are left unused.